Organic light-emitting device and display apparatus including the same

ABSTRACT

An organic light-emitting device includes a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode. The organic layer includes an emission layer. The emission layer includes a first compound, a second compound, and a third compound. The first compound is represented by Formula 1, the second compound is represented by Formula 2, the third compound is represented by Formula 3, and the first compound and the second compound are different from each other.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2018-0165469, filed on Dec. 19, 2018, in the KoreanIntellectual Property Office, the disclosure of which is incorporatedherein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to an organic light-emitting device and adisplay apparatus including the same.

2. Description of the Related Art

Organic light-emitting devices are self-emission devices, have wideviewing angles, high contrast ratios, short response times, as well asexcellent characteristics in terms of brightness, driving voltage, andresponse speed, and produce full-color images.

An example of such organic light-emitting devices may include a firstelectrode disposed on a substrate, and a hole transport region, anemission layer, an electron transport region, and a second electrode,which are sequentially disposed on the first electrode. Holes providedfrom the first electrode may move toward the emission layer through thehole transport region, and electrons provided from the second electrodemay move toward the emission layer through the electron transportregion. Carriers, such as holes and electrons, recombine in the emissionlayer to produce excitons. These excitons transit from an excited stateto a ground state, thereby generating light.

SUMMARY

An aspect according to one or more embodiments of the present disclosureis directed toward an organic light-emitting device and a displayapparatus including the same.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to an embodiment of the present disclosure, an organiclight-emitting device includes: a first electrode; a second electrode;and an organic layer between the first electrode and the secondelectrode, wherein the organic layer includes an emission layer, theemission layer includes a first compound, a second compound, and a thirdcompound, the first compound is represented by Formula 1, the secondcompound is represented by Formula 2, the third compound is representedby Formula 3, and the first compound and the second compound aredifferent from each other:

In Formulae 1 to 3, 1A, and 2A to 2C,

L₁₁ may be selected from:

a π electron-depleted nitrogen-free cyclic group; and

a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₃₁)(Q₃₂)(Q₃₃),

a11 may be selected from 0, 1, 2, and 3,

Y₁₁ may be a group represented by Formula 1A,

Y₁₂ may be selected from:

—F, a cyano group, and a π electron-depleted nitrogen-containing cyclicgroup;

a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, eachsubstituted with at least one selected from —F and a cyano group; and

a π electron-depleted nitrogen-containing cyclic group substituted withat least one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group,

c11 and c12 may each independently be selected from 1, 2, and 3,

X₁₁ may be selected from a single bond, N(R₁₃), O, and S,

X₁₂ may be selected from a single bond, N(R₁₄), O, and S,

X₁₁ and X₁₂ may not be a single bond at the same time,

A₁₁ and A₁₂ may each independently be a n electron-depletednitrogen-free cyclic group,

R₁₁ to R₁₄ may each independently be selected from:

a binding site, hydrogen, deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₁)(Q₂)(Q₃);

a π electron-depleted nitrogen-free cyclic group substituted withdeuterium, a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-freecyclic group, and —Si(Q₃₁)(Q₃₂)(Q₃₃); and

a π electron-depleted nitrogen-free cyclic group substituted with a πelectron-depleted nitrogen-free cyclic group that is substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃),wherein one selected from R₁₁ to R₁₄ may be a binding site,

b11 and b12 may each independently be selected from 1, 2, 3, 4, 5, and6,

L₂₁ may be selected from a substituted or unsubstituted C₅-C₆₀carbocyclic group and a substituted or unsubstituted C₁-C₆₀ heterocyclicgroup,

a21 may be selected from 0, 1, 2, and 3,

Y₂₁ may be a group represented by one selected from Formulae 2A to 2C,

Y₂₂ may be selected from:

—F, a cyano group, and a π electron-depleted nitrogen-containing cyclicgroup;

a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, eachsubstituted with at least one selected from —F and a cyano group; and

a π electron-depleted nitrogen-containing cyclic group substituted withat least one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group,

c21 and c22 may each independently be selected from 1, 2, 3, 4, 5, and6,

X₂₁ may be selected from a single bond, N(R₂₄), O, and S,

X₂₂ may be selected from a single bond, N(R₂₅), O, and S,

X₂₃ may be selected from a single bond, N(R₂₆), O, and S,

A₂₁ to A₂₃ may each independently be a π electron-depleted nitrogen-freecyclic group,

R₂₁ to R₂₆ may each independently be selected from:

a binding site, hydrogen, deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, —N(Q₁)(Q₂), and—Si(Q₁)(Q₂)(Q₃);

a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, —N(Q₃₁)(Q₃₂), and—Si(Q₃₁)(Q₃₂)(Q₃₃); and

a π electron-depleted nitrogen-free cyclic group substituted with a Telectron-depleted nitrogen-free cyclic group that is substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, —N(Q₂₁)(Q₂₂), and—Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selected from R₂₁ to R₂₄ in Formula 2Amay be a binding site, one selected from R₂₁ to R₂₅ in Formula 2B may bea binding site, and one selected from R₂₁ to R₂₆ in Formula 2C may be abinding site,

b21 to b23 may each independently be selected from 1, 2, 3, 4, 5, and 6,

L₃₁ may be selected from a substituted or unsubstituted C₅-C₆₀carbocyclic group and a substituted or unsubstituted C₁-C₆₀ heterocyclicgroup,

a31 may be selected from 0, 1, 2, and 3,

R₃₁ to R₃₇ may each independently be selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —B(Q₁)(Q₂), —N(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁),—S(═O)(Q₁), —S(═O)₂(Q₁), —P(═O)(Q₁)(Q₂), and —P(═S)(Q₁)(Q₂), wherein R₃₁to R₃₇ may optionally be linked to form a substituted or unsubstitutedC₅-C₆₀ carbocyclic group or a substituted or unsubstituted C₁-C₆₀heterocyclic group,

b31 may be selected from 1, 2, 3, 4, 5, and 6,

Y₃₁ and Y₃₂ may each independently be selected from —F, —Cl, —Br, —I, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₆-C₆₀aryl group, and a substituted or unsubstituted C₆-C₆₀ aryloxy group,wherein Y₃₁ and Y₃₂ may optionally be linked to form a substituted orunsubstituted C₅-C₆₀ carbocyclic group or a substituted or unsubstitutedC₁-C₆₀ heterocyclic group,

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ hetero arylthio group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group, and

* indicates a binding site to a neighboring atom.

According to an embodiment of the present disclosure, a displayapparatus includes a thin film transistor (including a source electrode,a drain electrode, and an active layer); and the organic light-emittingdevice described above, wherein the first electrode of the organiclight-emitting device is electrically connected to one selected from thesource electrode and the drain source of the thin film transistor.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of an organic light-emittingdevice according to an embodiment;

FIG. 2 is a schematic cross-sectional view of an organic light-emittingdevice according to an embodiment;

FIG. 3 is a schematic cross-sectional view of an organic light-emittingdevice according to an embodiment; and

FIG. 4 is a schematic cross-sectional view of an organic light-emittingdevice according to an embodiment.

DETAILED DESCRIPTION

The present disclosure will now be described more fully with referenceto exemplary embodiments. The disclosure may, however, be embodied inmany different forms and should not be construed as being limited to theembodiments set forth herein; rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey the concept of the disclosure to those skilled in the art.Enhancements and features of the present invention, and how to achievethem will become apparent by reference to the embodiment that will bedescribed later in more detail, together with the accompanying drawings.This invention may, however, be embodied in many different forms andshould not be limited to the exemplary embodiments.

Hereinafter, embodiments are described in more detail by referring tothe attached drawings, and in the drawings, like reference numeralsdenote like elements, and a redundant explanation thereof will not beprovided herein.

As used herein, the singular forms “a,” “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise.

It will be further understood that the terms “comprises” and/or“comprising” as used herein specify the presence of stated features orcomponents, but do not preclude the presence or addition of one or moreother features or components.

It will be understood that when a layer, region, or component isreferred to as being “on” or “onto” another layer, region, or component,it may be directly or indirectly formed on the other layer, region, orcomponent. That is, for example, intervening layers, regions, orcomponents may be present.

Sizes of components in the drawings may be exaggerated for convenienceof explanation. In other words, because sizes and thicknesses ofcomponents in the drawings are arbitrarily illustrated for convenienceof explanation, the following embodiments of the present disclosure arenot limited thereto.

The term “organic layer” as used herein refers to a single layer and/ora plurality of layers disposed between the first electrode and thesecond electrode of the organic light-emitting device. A materialincluded in the “organic layer” is not limited to an organic material.

An organic light-emitting device according to an embodiment may include:a first electrode; a second electrode; and an organic layer between thefirst electrode and the second electrode, wherein the organic layer mayinclude an emission layer, the emission layer may include a firstcompound, a second compound, and a third compound, the first compoundmay be represented by Formula 1, the second compound may be representedby Formula 2, the third compound may be represented by Formula 3, andthe first compound and the second compound may be different from eachother:

In Formula 1 to 3, 1A and 2A to 2C,

L₁₁ may be selected from:

a π electron-depleted nitrogen-free cyclic group; and

a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₃₁)(Q₃₂)(Q₃₃),

a11 may be selected from 0, 1, 2, and 3,

Y₁₁ may be a group represented by Formula 1A,

Y₁₂ may be selected from:

—F, a cyano group, and a π electron-depleted nitrogen-containing cyclicgroup;

a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, eachsubstituted with at least one selected from —F and a cyano group; and

a π electron-depleted nitrogen-containing cyclic group substituted withat least one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group,

c11 and c12 may each independently be selected from 1, 2, and 3,

X₁₁ may be selected from a single bond, N(R₁₃), O, and S,

X₁₂ may be selected from a single bond, N(R₁₄), O, and S,

X₁₁ and X₁₂ may not be a single bond at the same time,

A₁₁ and A₁₂ may each independently be a π electron-depletednitrogen-free cyclic group,

R₁₁ to R₁₄ may each independently be selected from:

a binding site (e.g., to L₁₁), hydrogen, deuterium, a C₁-C₆₀ alkylgroup, and a π electron-depleted nitrogen-free cyclic group and—Si(Q₁)(Q₂)(Q₃);

a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₃₁)(Q₃₂)(Q₃₃);and

a π electron-depleted nitrogen-free cyclic group substituted with a πelectron-depleted nitrogen-free cyclic group that is substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃),wherein one selected from R₁₁ to R₁₄ may be a binding site (e.g., toL₁₁),

b11 and b12 may each independently be selected from 1, 2, 3, 4, 5, and6,

L₂₁ may be selected from a substituted or unsubstituted C₅-C₆₀carbocyclic group and a substituted or unsubstituted C₁-C₆₀ heterocyclicgroup,

a21 may be selected from 0, 1, 2, and 3,

Y₂₁ may be a group represented by one selected from Formulae 2A to 2C,

Y₂₂ may be selected from:

—F, a cyano group, and a π electron-depleted nitrogen-containing cyclicgroup;

a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, eachsubstituted with at least one selected from —F and a cyano group; and

a π electron-depleted nitrogen-containing cyclic group substituted withat least one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group,

c21 and c22 may each independently be selected from 1, 2, 3, 4, 5, and6,

X₂₁ may be selected from a single bond, N(R₂₄), O, and S,

X₂₂ may be selected from a single bond, N(R₂₅), O, and S,

X₂₃ may be selected from a single bond, N(R₂₆), O, and S,

A₂₁ to A₂₃ may each independently be a π electron-depleted nitrogen-freecyclic group,

R₂₁ to R₂₆ may each independently be selected from:

a binding site (e.g., to L₂₁), hydrogen, deuterium, a C₁-C₆₀ alkylgroup, a π electron-depleted nitrogen-free cyclic group, —N(Q₁)(Q₂), and—Si(Q₁)(Q₂)(Q₃);

a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, —N(Q₃₁)(Q₃₂), and—Si(Q₃₁)(Q₃₂)(Q₃₃); and

a π electron-depleted nitrogen-free cyclic group substituted with a πelectron-depleted nitrogen-free cyclic group that is substituted with atleast one selected from deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, —N(Q₂₁)(Q₂₂), and—Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selected from R₂₁ to R₂₄ in Formula 2Amay be a binding site (e.g., to L₂₁), one selected from R₂₁ to R₂₅ inFormula 2B may be a binding site (e.g., to L₂₁), and one selected fromR₂₁ to R₂₆ in Formula 2C may be a binding site (e.g., to L₂₁);

b21 to b23 may each independently be selected from 1, 2, 3, 4, 5, and 6,

L₃₁ may be selected from a substituted or unsubstituted C₅-C₆₀carbocyclic group and a substituted or unsubstituted C₁-C₆₀ heterocyclicgroup,

a31 may be selected from 0, 1, 2, and 3; and

R₃₁ to R₃₇ may each independently be selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamino group, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —B(Q₁)(Q₂), —N(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁),—S(═O)(Q₁), —S(═O)₂(Q₁), —P(═O)(Q₁)(Q₂), and —P(═S)(Q₁)(Q₂),

R₃₁ to R₃₇ may optionally be linked (e.g., to a neighboring group) toform a substituted or unsubstituted C₅-C₆₀ carbocyclic group or asubstituted or unsubstituted C₁-C₆₀ heterocyclic group,

b31 may be selected from 1, 2, 3, 4, 5, and 6,

Y₃₁ and Y₃₂ may each independently be selected from —F, —Cl, —Br, —I, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₆-C₆₀aryl group, and a substituted or unsubstituted C₆-C₆₀ aryloxy group,wherein Y₃₁ and Y₃₂ may optionally be linked to form a substituted orunsubstituted C₅-C₆₀ carbocyclic group or a substituted or unsubstitutedC₁-C₆₀ heterocyclic group,

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ hetero arylthio group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group, and

* indicates a binding site to a neighboring atom.

For example, L₁₁ in Formula 1 may be selected from:

a benzene group, a naphthalene group, a phenalene group, an anthracenegroup, a fluoranthene group, a triphenylene group, a phenanthrene group,a pyrene group, a chrysene group, a perylene group, a fluorene group, acarbazole group, a dibenzofuran group, and a dibenzothiophene group; and

a benzene group, a naphthalene group, a phenalene group, an anthracenegroup, a fluoranthene group, a triphenylene group, a phenanthrene group,a pyrene group, a chrysene group, a perylene group, a fluorene group, acarbazole group, a dibenzofuran group, and a dibenzothiophene group,each substituted with at least one selected from deuterium, a C₁-C₂₀alkyl group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, but embodiments of the present disclosure arenot limited thereto.

For example, L₂₁ and L₃₁ in Formulae 2 and 3 may each independently beselected from:

a benzene group, a naphthalene group, a phenalene group, an anthracenegroup, a fluoranthene group, a triphenylene group, a phenanthrene group,a pyrene group, a chrysene group, a perylene group, a pyridine group, apyrimidine group, a pyrazine group, a pyridazine group, a triazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a benzoisoquinoline group, a phthalazine group, a naphthyridine group, aquinoxaline group, a benzoquinoxaline group, a quinazoline group, abenzoquinazoline group, a fluorene group, a carbazole group, adibenzofuran group, and a dibenzothiophene group; and

a benzene group, a naphthalene group, a phenalene group, an anthracenegroup, a fluoranthene group, a triphenylene group, a phenanthrene group,a pyrene group, a chrysene group, a perylene group, a pyridine group, apyrimidine group, a pyrazine group, a pyridazine group, a triazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a benzoisoquinoline group, a phthalazine group, a naphthyridine group, aquinoxaline group, a benzoquinoxaline group, a quinazoline group, abenzoquinazoline group, a fluorene group, a carbazole group, adibenzofuran group, and a dibenzothiophene group, each substituted withat least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

For example, a11, a21, and a31 in Formulae 1 to 3 may each independentlybe selected from 0 and 1, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 1A, X₁₁ may be selected from N(R₁₃), O, and S,and

X₁₂ may be a single bond, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 1A, A₁₁ and A₁₂ may each independently beselected from a benzene group, a naphthalene group, a fluorene group, acarbazole group, a dibenzofuran group, a dibenzothiophene group, abenzofluorene group, a benzocarbazole group, a benzonaphthofuran group,a benzonaphthothiophene group, an indolofluorene group, anindolocarbazole group, an indolodibenzofuran group, anindolodibenzothiophene group, an indenofluorene group, anindenocarbazole group, an indenodibenzofuran group, anindenodibenzothiophene group, a benzofuranofluorene group, abenzofuranocarbazole group, a benzofuranodibenzofuran group, abenzofuranodibenzothiophene group, a benzothienofluorene group, abenzothienocarbazole group, a benzothienodibenzofuran group, and abenzothienodibenzothiophene group, but embodiments of the presentdisclosure are not limited thereto.

For example, in Formula 1A, R₁₁ to R₁₄ may each independently beselected from:

a binding site, hydrogen, deuterium, a C₁-C₂₀ alkyl group, a phenylgroup, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, and —Si(Q₁)(Q₂)(Q₃);

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, each substituted with at least one selectedfrom deuterium, a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, a dinaphthothiophenyl group, and —Si(Q₃₁)(Q₃₂)(Q₃₃); and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, each substituted with at least one selectedfrom a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group that are each substituted with at least oneselected from deuterium, a C₁-C₂₀ alkyl group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a triphenylenyl group, a chrysenyl group, a fluoranthenyl group,a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, a dinaphthothiophenyl group, and —Si(Q₂₁)(Q₂₂)(Q₂₃),

one selected from R₁₁ to R₁₄ may be a binding site,

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, but embodiments of the present disclosure arenot limited thereto.

In one embodiment, in Formula 1A, R₁₁ to R₁₄ may each independently beselected from:

a binding site, hydrogen, deuterium, a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, and —Si(Q₁)(Q₂)(Q₃);

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, a methyl group, an ethylgroup, an n-propyl group, an isopropyl group, an n-butyl group, anisobutyl group, a sec-butyl group, a tert-butyl group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, and —Si(Q₃₁)(Q₃₂)(Q₃₃); and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, and adibenzothiophenyl group, that are each substituted with at least oneselected from deuterium, a methyl group, an ethyl group, an n-propylgroup, an isopropyl group, an n-butyl group, an isobutyl group, asec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, and —Si(Q₂₁)(Q₂₂)(Q₂₃),

one selected from R₁₁ to R₁₄ may be a binding site,

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a fluorenyl group, acarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

For example, in Formula 1, Y₁₂ may be selected from:

—F, a cyano group, a pyridinyl group, a pyrazinyl group, a pyridazinylgroup, a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;

a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from —F and a cyano group;and

a pyridinyl group, a pyrazinyl group, a pyridazinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinolinyl group, an isoquinolinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, an azafluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, a diazafluorenyl group, a diazacarbazolyl group, adiazadibenzofuranyl group, and a diazadibenzothiophenyl group, eachsubstituted with at least one selected from deuterium, a C₁-C₂₀ alkylgroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

In one embodiment, Y₁₂ in Formula 1 may be selected from:

—F, a cyano group, a pyridinyl group, a pyrazinyl group, a pyridazinylgroup, a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, and a quinazolinyl group;

a methyl group, an ethyl group, an n-propyl group, an isopropyl group,an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butylgroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a pyridinyl group, apyrazinyl group, a pyridazinyl group, a pyrimidinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinolinyl group,an isoquinolinyl group, a naphthyridinyl group, a quinoxalinyl group,and a quinazolinyl group, each substituted with at least one selectedfrom —F and a cyano group; and

a pyridinyl group, a pyrazinyl group, a pyridazinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinolinyl group, an isoquinolinyl group, a naphthyridinyl group, aquinoxalinyl group, and a quinazolinyl group, each substituted with atleast one selected from deuterium, a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, and a quinazolinyl group,but embodiments of the present disclosure are not limited thereto.

For example, in Formula 1, c11 and c12 may each independently be 1, butembodiments of the present disclosure are not limited thereto.

For example, in Formulae 2A to 2C, X₂₁ may be a single bond, X₂₂ may bea single bond, and X₂₃ may be a single bond, but embodiments of thepresent disclosure are not limited thereto.

For example, in Formulae 2A to 2C, A₂₁ to A₂₃ may each independently beselected from a benzene group, a naphthalene group, a fluorene group, acarbazole group, a dibenzofuran group, a dibenzothiophene group, anindolofluorene group, an indolocarbazole group, an indolodibenzofurangroup, an indolodibenzothiophene group, an indenofluorene group, anindenocarbazole group, an indenodibenzofuran group, anindenodibenzothiophene group, a benzofuranofluorene group, abenzofuranocarbazole group, a benzofuranodibenzofuran group, abenzofuranodibenzothiophene group, a benzothienofluorene group, abenzothienocarbazole group, a benzothienodibenzofuran group, and abenzothienodibenzothiophene group, but embodiments of the presentdisclosure are not limited thereto.

In one embodiment, in Formula 2, Y₂₁ may be a group represented byFormula 2A, but embodiments of the present disclosure are not limitedthereto.

For example, in Formulae 2A to 2C, R₂₁ to R₂₆ may each independently beselected from:

a binding site, hydrogen, deuterium, a C₁-C₂₀ alkyl group, a phenylgroup, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, —N(Q₁)(Q₂), and —Si(Q₁)(Q₂)(Q₃);

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, each substituted with at least one selectedfrom deuterium, a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, a dinaphthothiophenyl group, —N(Q₃₁)(Q₃₂), and—Si(Q₃₁)(Q₃₂)(Q₃₃); and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, each substituted with at least one selectedfrom a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group that are each independently substituted withat least one selected from deuterium, a C₁-C₂₀ alkyl group, a phenylgroup, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, —N(Q₂₁)(Q₂₂), and —Si(Q₂₁)(Q₂₂)(Q₂₃),

one selected from R₂₁ to R₂₄ in Formula 2A may be a binding site,

one selected from R₂₁ to R₂₅ in Formula 2B may be a binding site,

one selected from R₂₁ to R₂₆ in Formula 2C may be a binding site, and

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group, but embodiments of the present disclosure arenot limited thereto.

In one embodiment, in Formulae 2A to 2C, R₂₁ to R₂₆ may eachindependently be selected from:

a binding site, hydrogen, deuterium, a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, —N(Q₁)(Q₂), and —Si(Q₁)(Q₂)(Q₃);

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, a methyl group, an ethylgroup, an n-propyl group, an isopropyl group, an n-butyl group, anisobutyl group, a sec-butyl group, a tert-butyl group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, —N(Q₃₁)(Q₃₂), and —Si(Q₃₁)(Q₃₂)(Q₃₃); and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, and adibenzothiophenyl group that are each substituted with at least oneselected from deuterium, a methyl group, an ethyl group, an n-propylgroup, an isopropyl group, an n-butyl group, an isobutyl group, asec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, —N(Q₂₁)(Q₂₂), and —Si(Q₂₁)(Q₂₂)(Q₂₃),

one selected from R₂₁ to R₂₄ in Formula 2A may be a binding site,

one selected from R₂₁ to R₂₅ in Formula 2B may be a binding site,

one selected from R₂₁ to R₂₆ in Formula 2C may be a binding site, and

Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be selectedfrom a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a fluorenyl group, acarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

For example, in Formula 2, Y₂₂ may be selected from:

—F, a cyano group, a pyridinyl group, a pyrazinyl group, a pyridazinylgroup, a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;

a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from —F and a cyano group;and

a pyridinyl group, a pyrazinyl group, a pyridazinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinolinyl group, an isoquinolinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, an azafluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, a diazafluorenyl group, a diazacarbazolyl group, adiazadibenzofuranyl group, and a diazadibenzothiophenyl group, eachsubstituted with at least one selected from deuterium, a C₁-C₂₀ alkylgroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

In one embodiment, in Formula 2, Y₂₂ may be selected from:

—F, a cyano group, a pyridinyl group, a pyrazinyl group, a pyridazinylgroup, a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, and a quinazolinyl group;

a methyl group, an ethyl group, an n-propyl group, an isopropyl group,an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butylgroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a pyridinyl group, apyrazinyl group, a pyridazinyl group, a pyrimidinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinolinyl group,an isoquinolinyl group, a naphthyridinyl group, a quinoxalinyl group,and a quinazolinyl group, each substituted with at least one selectedfrom —F and a cyano group; and

a pyridinyl group, a pyrazinyl group, a pyridazinyl group, a pyrimidinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinolinyl group, an isoquinolinyl group, a naphthyridinyl group, aquinoxalinyl group, and a quinazolinyl group, each substituted with atleast one selected from deuterium, a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, a tert-butyl group, a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, and a quinazolinyl group,but embodiments of the present disclosure are not limited thereto.

For example, in Formula 2, c21 and c22 may each independently beselected from 1, 2, and 3, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 3, R₃₁ to R₃₇ may each independently be selectedfrom:

hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, a C₁-C₂₀ alkylgroup, and a C₁-C₂₀ alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a cyano group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;and

—B(Q₁)(Q₂) and —N(Q₁)(Q₂), and

Q₁ and Q₂ may each independently be selected from:

hydrogen, deuterium, and a C₁-C₂₀ alkyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from deuterium, a C₁-C₂₀alkyl group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

In one embodiment, in Formula 3, R₃₁ to R₃₇ may each independently beselected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, a methyl group, anethyl group, an n-propyl group, an isopropyl group, an n-butyl group, anisobutyl group, a sec-butyl group, a tert-butyl group, a methoxy group,an ethoxy group, a propoxy group, and a butoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a cyanogroup, a methyl group, an ethyl group, an n-propyl group, an isopropylgroup, an n-butyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a methoxy group, an ethoxy group, a propoxy group, abutoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, and a dibenzothiophenyl group; and

—B(Q₁)(Q₂) and —N(Q₁)(Q₂), and

Q₁ and Q₂ may each independently be selected from:

hydrogen, deuterium, a methyl group, an ethyl group, an n-propyl group,an isopropyl group, an n-butyl group, an isobutyl group, a sec-butylgroup, and a tert-butyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, a methyl group, an ethylgroup, an n-propyl group, an isopropyl group, an n-butyl group, anisobutyl group, a sec-butyl group, a tert-butyl group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a triphenylenyl group, a chrysenyl group, a fluoranthenyl group,a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, and adibenzothiophenyl group, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 3, Y₃₁ and Y₃₂ may each independently beselected from —F, —Cl, —Br, —I, a C₁-C₂₀ alkyl group, and a C₁-C₂₀alkoxy group, but embodiments of the present disclosure are not limitedthereto.

In one embodiment, in Formula 3, Y₃₁ and Y₃₂ may each independently beselected from —F, a methyl group, an ethyl group, an n-propyl group, anisopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group,a tert-butyl group, a methoxy group, an ethoxy group, a propoxy group,and a butoxy group, but embodiments of the present disclosure are notlimited thereto.

In one embodiment, the first compound may be selected from compounds ofGroup I:

In one embodiment, the second compound may be selected from groups ofGroup II:

In one embodiment, the third compound may be selected from groups ofGroup III:

Because the first compound is a compound including both the electrontransport moiety and the hole transport moiety, an organiclight-emitting device including the first compound may improve chargebalance of electrons and holes. Therefore, the organic light-emittingdevice may provide improved efficiency and/or improved lifespan.

The second compound may satisfy Condition 1:ΔE _(ST)(C2)≤0.3 eV.  Condition 1

In Condition 1,

ΔE_(ST)(C2) represents a difference between a lowest excitation singletenergy level of the second compound (E_(S1)(C2)) and a lowest excitationtriplet energy level of the second compound (E_(T1)(C2)).

E_(S1)(C2) and E_(T1)(C2) may be evaluated by utilizing a densityfunctional theory (DFT) method of Gaussian program structurallyoptimized at a level of B3LYP/6-31G(d,p).

When the second compound satisfies Condition 1, the second compound mayhave suitable (e.g., sufficiently high) reverse intersystem crossing(RISC) efficiency at room temperature.

The third compound may have a maximum emission wavelength in a range ofabout 520 nm to about 780 nm, but embodiments of the present disclosureare not limited thereto. For example, the third compound in the emissionlayer does not directly participate in the formation of excitons, andreceives energy from formed excitons and emits red fluorescence.

The organic light-emitting device may emit fluorescence in a range ofabout 520 nm to about 780 nm, but embodiments of the present disclosureare not limited thereto.

Because the organic light-emitting device has an energy level enough toemit fluorescence from the third compound, the organic light-emittingdevice may have suitable (e.g., high) color purity. In addition, becausethe second compound has suitable (e.g., sufficiently high) RISCefficiency at room temperature, all the triplet energy of the firstcompound that may not participate in light emission may be transmittedto the third compound. Because it is possible to reduce or minimizeexcitons that disappear without participating in light emission, theefficiency of the organic light-emitting device may be improved.

The amount of the first compound in the emission layer may be in a rangeof about 60 wt % to about 90 wt % based on the total weight of theemission layer, but embodiments of the present disclosure are notlimited thereto.

The amount of the second compound in the emission layer may be in arange of about 10 wt % to about 40 wt % based on the total weight of theemission layer, but embodiments of the present disclosure are notlimited thereto.

The amount of the third compound in the emission layer may be in a rangeof about 0.5 wt % to about 5 wt % based on the total weight of theemission layer, but embodiments of the present disclosure are notlimited thereto.

When the first compound, the second compound, and the third compound arewithin these ranges, an organic light-emitting device having bothimproved efficiency and improved lifespan may be provided.

In one embodiment, the emission layer may include or consist of (i.e.,include only) the first compound, the second compound, and the thirdcompound, but embodiments of the present disclosure are not limitedthereto.

In one embodiment, the organic layer may further include a holetransport region; the hole transport region may be disposed between thefirst electrode and the emission layer; the hole transport region mayinclude a first hole transport layer and a second hole transport layer;the first hole transport layer may include a first hole transportmaterial; the second hole transport layer may include a second holetransport material; and the first hole transport material and the secondhole transport material may be different from each other.

Because the organic light-emitting device includes the first holetransport layer and the second hole transport layer, hole injection fromthe anode may be facilitated, and the lifespan and the efficiency of theorganic light-emitting device may be improved.

For example, the first hole transport material may be represented byFormula 201:

In Formula 201,

L₂₀₁ to L₂₀₃ may each independently be selected from a substituted orunsubstituted C₅-C₆₀ carbocyclic group, and a substituted orunsubstituted C₁-C₆₀ heterocyclic group,

a201 to a203 may each independently be selected from 0, 1, 2, and 3,

Cz may be a substituted or unsubstituted carbazolyl group,

FIr may be selected from a substituted or unsubstituted fluorenyl groupand a substituted or unsubstituted a spiro-bifluorenyl group, and

R₂₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group.

For example, in Formula 201, L₂₀₁ to L₂₀₃ may each independently beselected from a phenylene group, a pentalenylene group, an indenylenegroup, a naphthylene group, an azulenylene group, a heptalenylene group,an indacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀ alkyl group,a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, and a naphthyl group, but embodiments of the present disclosureare not limited thereto.

For example, in Formula 201, a201 to a203 may each independently beselected from 0, 1, and 2, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 201, Cz may be selected from:

a carbazolyl group; and

a carbazolyl group substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ are the same as described above with respect to L₂₀₁ to L₂₀₃,but embodiments of the present disclosure are not limited thereto.

In one embodiment, in Formula 201, Cz may be selected from:

a carbazolyl group; and

a carbazolyl group substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, acarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

For example, in Formula 201, FIr may be selected from:

a fluorenyl group and a spiro-bifluorenyl group; and

a fluorenyl group and a spiro-bifluorenyl group, each substituted withat least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a phenyl group substituted with a C₁-C₁₀ alkylgroup, a phenyl group substituted with —F, a pentalenyl group, anindenyl group, a naphthyl group, an azulenyl group, a heptalenyl group,an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ are the same as described above with respect to L₂₀₁ to L₂₀₃,but embodiments of the present disclosure are not limited thereto.

In one embodiment, in Formula 201, FIr may be selected from:

a fluorenyl group and a spiro-bifluorenyl group; and

a fluorenyl group and a spiro-bifluorenyl group, each substituted withat least one selected from a fluorenyl group and a spiro-bifluorenylgroup deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a phenyl group substituted with a C₁-C₁₀ alkyl group, a phenyl groupsubstituted with —F, a naphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, anda dibenzothiophenyl group, but embodiments of the present disclosure arenot limited thereto.

For example, in Formula 201, R₂₀₁ may be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ are the same as described above with respect to L₂₀₁ to L₂₀₃.

In one embodiment, the first hole transport material may be selectedfrom groups of Group IV, but embodiments of the present disclosure arenot limited thereto:

For example, the second hole transport material may be represented byFormula 202:

In Formulae 202 and 202A,

L₂₁₁ to L₂₁₃ may each independently be selected from a substituted orunsubstituted C₅-C₆₀ carbocyclic group, and a substituted orunsubstituted C₁-C₆₀ heterocyclic group

a211 to a213 may each independently be selected from 0, 1, 2, and 3,

R₂₁₁ to R₂₁₃ may each independently be selected from a group representedby Formula 202A, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group,a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, wherein at least one selected from R₂₁₁ to R₂₁₃may be a group represented by Formula 202A,

X₂₂₁ may be selected from N(R₂₂₃), C(R₂₂₃)(R₂₂₄), O, and S,

A₂₂₁ and A₂₂₂ may each independently be selected from i) a 6-memberedring, ii) a condensed ring in which two or more 6-membered rings arecondensed with each other, and iii) a condensed ring in which at leastone 6-membered ring and at least one 5-membered ring are condensed witheach other,

R₂₂₁ to R₂₂₄ may each independently be selected from a binding site(e.g., to a respective L₂₁₁ to L₂₁₃), hydrogen, deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a substituted or unsubstitutedC₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group,a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₀₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, wherein one selected fromR₂₂₁ to R₂₂₄ may be a binding site, and

b221 and b222 may each independently be selected from 1, 2, 3, 4, 5, and6.

For example, L₂₁₁ to L₂₁₃ in Formula 202 may each independently be thesame as defined in connection with L₂₀₁.

For example, a211 to a213 in Formula 202 may each independently be thesame as defined in connection with a201.

For example, in Formula 202, R₂₁₁ to R₂₁₃ may each independently beselected from:

a group represented by Formula 202A, a phenyl group, a biphenyl group, aterphenyl group, a pentalenyl group, an indenyl group, a naphthyl group,an azulenyl group, a heptalenyl group, an indacenyl group, anacenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenylgroup, a picenyl group, a perylenyl group, a pentaphenyl group, ahexacenyl group, a pentacenyl group, a rubicenyl group, a coronenylgroup, an ovalenyl group, a thiophenyl group, a furanyl group, acarbazolyl group, an indolyl group, an isoindolyl group, a benzofuranylgroup, a benzothiophenyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, a dibenzosilolyl group, and a pyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂),

at least one selected from R₂₁₁ to R₂₁₃ may be a group represented byFormula 202A, and

Q₃₁ to Q₃₃ are the same as described above with respect to L₂₀₁ to L₂₀₃.

For example, in Formula 202A, X₂₂₁ may be selected from C(R₂₂₃)(R₂₂₄)and O.

For example, in Formula 202A, the 6-membered ring may be selected from abenzene group, a pyridine group, a pyrimidine group, a pyridazine group,and a triazine group, and the 5-membered ring may be selected fromafuran group, a thiophene group, a pyrrole group, and a cyclopentadienegroup, but embodiments of the present disclosure are not limitedthereto.

In one embodiment, in Formula 202A, A₂₂₁ and A₂₂₂ may each independentlybe selected from a benzene group, a naphthalene group, a pyridine group,a pyrimidine group, a pyridazine group, a triazine group, a quinolinegroup, an isoquinoline group, a fluorene group, a carbazole group, adibenzothiophene group, and a dibenzofuran group, but embodiments of thepresent disclosure are not limited thereto.

For example, in Formula 202, R₂₂₁ to R₂₂₄ may each independently beselected from:

a binding site, hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, aC₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a cyano group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,and

one selected from R₂₂₁ to R₂₂₄ may be a binding site, but embodiments ofthe present disclosure are not limited thereto.

In one embodiment, in Formula 202, R₂₂₁ to R₂₂₄ may each independentlybe selected from:

a binding site, hydrogen, deuterium, —F, —Cl, —Br, —I, a cyano group, amethyl group, an ethyl group, an n-propyl group, an isopropyl group, ann-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group,a methoxy group, an ethoxy group, a propoxy group, and a butoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a cyanogroup, a methyl group, an ethyl group, an n-propyl group, an isopropylgroup, an n-butyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a methoxy group, an ethoxy group, a propoxy group, abutoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, and a dibenzothiophenyl group, and

one selected from R₂₂₁ to R₂₂₄ may be a binding site, but embodiments ofthe present disclosure are not limited thereto.

In embodiment, the second hole transport material may be selected fromgroups of Group V, but embodiments of the present disclosure are notlimited thereto:

In one embodiment, the organic layer may further include an electrontransport region, the electron transport region may be disposed betweenthe emission layer and the second electrode, and the electron transportregion may include a hole blocking layer, an electron transport layer,an electron injection layer, or any combination thereof, but embodimentsof the present disclosure are not limited thereto.

Description of FIG. 1

FIG. 1 is a schematic view of an organic light-emitting device 10according to an embodiment. The organic light-emitting device 10includes a first electrode 110, an organic layer 150, and a secondelectrode 190.

Hereinafter, the structure of the organic light-emitting device 10according to an embodiment and a method of manufacturing the organiclight-emitting device 10 will be described in connection with FIG. 1 .

First Electrode 110

In FIG. 1 , a substrate may be additionally disposed under the firstelectrode 110 or above the second electrode 190. The substrate may be aglass substrate or a plastic substrate, each having excellent mechanicalstrength, thermal stability, transparency, surface smoothness, ease ofhandling, and/or water resistance.

The first electrode 110 may be formed by depositing or sputtering amaterial for forming the first electrode 110 on the substrate. When thefirst electrode 110 is an anode, the material for the first electrodemay be selected from materials with a high work function to facilitatehole injection.

The first electrode 110 may be a reflective electrode, asemi-transmissive electrode, or a transmissive electrode. When the firstelectrode 110 is a transmissive electrode, a material for forming thefirst electrode may be selected from indium tin oxide (ITO), indium zincoxide (IZO), tin oxide (SnO₂), zinc oxide (ZnO), and any combinationsthereof, but embodiments of the present disclosure are not limitedthereto. In one or more embodiments, when the first electrode 110 is asemi-transmissive electrode or a reflectable electrode, a material forforming the first electrode may be selected from magnesium (Mg), silver(Ag), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca),magnesium-indium (Mg—In), magnesium-silver (Mg—Ag), and any combinationsthereof, but embodiments of the present disclosure are not limitedthereto.

The first electrode 110 may have a single-layered structure, or amulti-layered structure including two or more layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but the structure of the first electrode 110 is not limited thereto.

Organic Layer 150

The organic layer 150 is disposed on the first electrode 110. Theorganic layer 150 may include an emission layer.

The organic layer 150 may further include a hole transport regionbetween the first electrode 110 and the emission layer, and an electrontransport region between the emission layer and the second electrode190.

Hole Transport Region in Organic Layer 150

The hole transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The hole transport region may include at least one layer selected from ahole injection layer, a hole transport layer, an emission auxiliarylayer, and an electron blocking layer.

For example, the hole transport region may have a single-layeredstructure including a single layer including a plurality of differentmaterials, or a multi-layered structure having a hole injectionlayer/hole transport layer structure, a hole injection layer/holetransport layer/emission auxiliary layer structure, a hole injectionlayer/emission auxiliary layer structure, a hole transportlayer/emission auxiliary layer structure, or a hole injection layer/holetransport layer/electron blocking layer structure, wherein for eachstructure, constituting layers are sequentially stacked (e.g.,laminated) from the first electrode 110 in the stated order, but thestructure of the hole transport region is not limited thereto.

The hole transport region may include at least one selected fromm-MTDATA, TDATA, 2-TNATA, NPB(NPD), β-NPB, TPD, Spiro-TPD, Spiro-NPB,methylated-NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine(TCTA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS),polyaniline/camphor sulfonic acid (PANI/CSA),polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound representedby Formula 201-1, and a compound represented by Formula 202-1.

For example, when the hole transport region includes the first holetransport material and the second hole transport material, the holetransport region may further include a compound represented by Formula201-1 and/or a compound represented by Formula 202-1, wherein thecompound represented by Formula 201-1 and the compound represented byFormula 202-1 are different from the first hole transport material andthe second hole transport material:

In Formulae 201-1 and 202-1,

L₂₀₁ to L₂₀₄ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group;

L₂₀₅ may be selected from *—O—*′, *—S—*′, *—N(Q₂₀₁)-*′, a substituted orunsubstituted C₁-C₂₀ alkylene group, a substituted or unsubstitutedC₂-C₂₀ alkenylene group, a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group,

xa1 to xa4 may each independently be an integer of 0 to 3,

xa5 may be an integer of 1 to 10, and

R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independently be selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₀₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.

In one embodiment, in Formula 202-1, R₂₀₁ and R₂₀₂ may optionally belinked via a single bond, a dimethyl-methylene group, or adiphenyl-methylene group, and R₂₀₃ and R₂₀₄ may optionally be linked viaa single bond, a dimethyl-methylene group, or a diphenyl-methylenegroup.

In one embodiment, in Formulae 201-1 and 202-1,

L₂₀₁ to L₂₀₅ may each independently be selected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀ alkyl group,a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, and a naphthyl group.

In one or more embodiments, xa1 to xa4 may each independently be 0, 1,or 2.

In one or more embodiments, xa5 may be 1, 2, 3, or 4.

In one or more embodiments, R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independentlybe selected from:

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and

Q₃₁ to Q₃₃ are the same as described above with respect to L₂₀₁ to L₂₀₅.

In one or more embodiments, in Formula 201-1, at least one selected fromR₂₀₁ to R₂₀₃ may each independently be selected from:

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group; and

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a phenyl group substituted with a C₁-C₁₀ alkylgroup, a phenyl group substituted with —F, a naphthyl group, a fluorenylgroup, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranylgroup, and a dibenzothiophenyl group,

but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, in Formula 202-1, i) R₂₀₁ and R₂₀₂ may belinked via a single bond, and/or ii) R₂₀₃ and R₂₀₄ may be linked via asingle bond.

In one or more embodiments, in Formula 202-1, at least one selected fromR₂₀₁ to R₂₀₄ may be selected from:

a carbazolyl group; and

a carbazolyl group substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, acarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,

but embodiments of the present disclosure are not limited thereto.

The compound represented by Formula 201-1 may be represented by Formula201A:

In one embodiment, the compound represented by Formula 201-1 may berepresented by Formula 201A(1), but embodiments of the presentdisclosure are not limited thereto:

In one embodiment, the compound represented by Formula 201-1 may berepresented by Formula 201A-1, but embodiments of the present disclosureare not limited thereto:

In one embodiment, the compound represented by Formula 202-1 may berepresented by Formula 202AA:

In one embodiment, the compound represented by Formula 202-1 may berepresented by Formula 202A-1:

In Formulae 201A, 201A(1), 201A-1, 202AA, and 202A-1,

L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, and R₂₀₂ to R₂₀₄ are the same asdescribed above with respect to Formulae 201-1 and 202-1,

R₂₁₁ and R₂₁₂ may each independently be the same as defined inconnection with R₂₀₃ of Formulae 201-1 and 202-1

R₂₁₃ to R₂₁₇ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group.

The hole transport region may include at least one compound selectedfrom Compounds HT1 to HT39, but embodiments of the present disclosureare not limited thereto:

A thickness of the hole transport region may be in a range of about 100Å to about 10,000 Å, for example, about 100 Å to about 1,000 Å. When thehole transport region includes at least one of a hole injection layerand a hole transport layer, a thickness of the hole injection layer maybe in a range of about 100 Å to about 9,000 Å, for example, about 100 Åto about 1,000 Å, and a thickness of the hole transport layer may be ina range of about 50 Å to about 2,000 Å, for example, about 100 Å toabout 1,500 Å. When the thicknesses of the hole transport region, thehole injection layer, and the hole transport layer are within theseranges, satisfactory hole transporting characteristics may be obtainedwithout a substantial increase in driving voltage.

The emission auxiliary layer may increase light-emission efficiency bycompensating for an optical resonance distance according to thewavelength of light emitted by an emission layer, and the electronblocking layer may block the flow of electrons from an electrontransport region. The emission auxiliary layer and the electron blockinglayer may include the materials as described above.

p-Dopant

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant.

In one embodiment, the p-dopant may have a lowest unoccupied molecularorbital (LUMO) level of −3.5 eV or less.

The p-dopant may include at least one selected from a quinonederivative, a metal oxide, and a cyano group-containing compound, butembodiments of the present disclosure are not limited thereto.

For example, the p-dopant may include at least one selected from:

a quinone derivative, such as tetracyanoquinodimethane (TCNQ) and/or2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ);

a metal oxide, such as tungsten oxide and/or molybdenum oxide;

1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN); and

a compound represented by Formula 221,

but embodiments of the present disclosure are not limited thereto:

In Formula 221,

R₂₂₁ to R₂₂₃ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, and at least one selectedfrom R₂₂₁ to R₂₂₃ may have at least one substituent selected from acyano group, —F, —Cl, —Br, —I, a C₁-C₂₀ alkyl group substituted with —F,a C₁-C₂₀ alkyl group substituted with —Cl, a C₁-C₂₀ alkyl groupsubstituted with —Br, and a C₁-C₂₀ alkyl group substituted with —I.

Emission Layer in Organic Layer 150

When the organic light-emitting device 10 is a full-color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, or a blue emission layer,according to a sub-pixel. In one or more embodiments, the emission layermay have a stacked structure of two or more layers selected from a redemission layer, a green emission layer, and a blue emission layer, inwhich the two or more layers contact each other or are separated fromeach other. In one or more embodiments, the emission layer may includetwo or more materials selected from a red light-emitting material, agreen light-emitting material, and a blue light-emitting material, inwhich the two or more materials are mixed with each other in a singlelayer to emit white light.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. When thethickness of the emission layer is within these ranges, excellentlight-emission characteristics may be obtained without a substantialincrease in driving voltage.

Electron Transport Region in Organic Layer 150

The electron transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron transport region may include at least one selected from abuffer layer, a hole blocking layer, an electron control layer, anelectron transport layer, and an electron injection layer, butembodiments of the present disclosure are not limited thereto.

For example, the electron transport region may have an electrontransport layer/electron injection layer structure, a hole blockinglayer/electron transport layer/electron injection layer structure, anelectron control layer/electron transport layer/electron injection layerstructure, or a buffer layer/electron transport layer/electron injectionlayer structure, wherein for each structure, constituting layers aresequentially stacked (e.g., laminated) from an emission layer. However,embodiments of the structure of the electron transport region are notlimited thereto.

The electron transport region (for example, a buffer layer, a holeblocking layer, an electron control layer, and/or an electron transportlayer in the electron transport region) may include a metal-freecompound containing at least one π electron-depleted nitrogen-containingring.

The term “π electron-depleted nitrogen-containing ring” as used hereinrefers to a C₁-C₆₀ heterocyclic group having at least one *—N=*′ moietyas a ring-forming moiety.

For example, the “π electron-depleted nitrogen-containing ring” may bei) a 5-membered to 7-membered heteromonocyclic group having at least one*—N=*′ moiety, ii) a heteropolycyclic group in which two or more5-membered to 7-membered heteromonocyclic groups each having at leastone *—N=*′ moiety are condensed with each other, or iii) aheteropolycyclic group in which at least one of 5-membered to 7-memberedheteromonocyclic groups, each having at least one *—N=*′ moiety, iscondensed with at least one C₅-C₆₀ carbocyclic group.

Examples of the π electron-depleted nitrogen-containing ring include animidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, anisoxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, anindazole, a purine, a quinoline, an isoquinoline, a benzoquinoline, aphthalazine, a naphthyridine, a quinoxaline, a quinazoline, a cinnoline,a phenanthridine, an acridine, a phenanthroline, a phenazine, abenzimidazole, an isobenzothiazole, a benzoxazole, an isobenzoxazole, atriazole, a tetrazole, an oxadiazole, a triazine, thiadiazol, animidazopyridine, an imidazopyrimidine, and an azacarbazole, butembodiments of the present disclosure are not limited thereto.

For example, the electron transport region may include a compoundrepresented by Formula 601:[Ar₆₀₁]_(xe11)-[(L₆₀₁)_(xe1)-R₆₀₁]_(xe21)  Formula 601

In Formula 601,

Ar₆₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic group ora substituted or unsubstituted C₁-C₆₀ heterocyclic group,

xe11 may be 1, 2, or 3,

L₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group,

xe1 may be an integer of 0 to 5,

R₆₀₁ may be selected from a substituted or unsubstituted C₃-C₀₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₆₀₁)(Q₆₀₂)(Q₆₀₃), —C(═O)(Q₆₀₁),—S(═O)₂(Q₆₀₁), and —P(═O)(Q₆₀₁)(Q₆₀₂),

Q₆₀₁ to Q₆₀₃ may each independently be a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or anaphthyl group, and

xe21 may be an integer of 1 to 5.

In one embodiment, at least one of Ar₆₀₁(s) in the number of xe11 andR₆₀₁(s) in the number of xe21 may include the π electron-depletednitrogen-containing ring.

In one embodiment, ring Ar₆₀₁ in Formula 601 may be selected from:

a benzene group, a naphthalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, a naphthacene group, a picene group, a perylene group, apentaphene group, an indenoanthracene group, a dibenzofuran group, adibenzothiophene group, a carbazole group, an imidazole group, apyrazole group, a thiazole group, an isothiazole group, an oxazolegroup, an isoxazole group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, an indazole group, a purine group,a quinoline group, an isoquinoline group, a benzoquinoline group, aphthalazine group, a naphthyridine group, a quinoxaline group, aquinazoline group, a cinnoline group, a phenanthridine group, anacridine group, a phenanthroline group, a phenazine group, abenzimidazole group, an isobenzothiazole group, a benzoxazole group, anisobenzoxazole group, a triazole group, a tetrazole group, an oxadiazolegroup, a triazine group, a thiadiazol group, an imidazopyridine group,an imidazopyrimidine group, and an azacarbazole group; and

a benzene group, a naphthalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, a naphthacene group, a picene group, a perylene group, apentaphene group, an indenoanthracene group, a dibenzofuran group, adibenzothiophene group, a carbazole group, an imidazole group, apyrazole group, a thiazole group, an isothiazole group, an oxazolegroup, an isoxazole group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, an indazole group, a purine group,a quinoline group, an isoquinoline group, a benzoquinoline group, aphthalazine group, a naphthyridine group, a quinoxaline group, aquinazoline group, a cinnoline group, a phenanthridine group, anacridine group, a phenanthroline group, a phenazine group, abenzimidazole group, an isobenzothiazole group, a benzoxazole group, anisobenzoxazole group, a triazole group, a tetrazole group, an oxadiazolegroup, a triazine group, a thiadiazole group, an imidazopyridine group,an imidazopyrimidine group, and an azacarbazole group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group,—Si(Q₃₁)(Q₃₂)(Q₃₃), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀ alkyl group,a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, and a naphthyl group.

When xe11 in Formula 601 is two or more, two or more Ar601(s) may belinked via a single bond.

In one or more embodiments, Ar₆₀₁ in Formula 601 may be an anthracenegroup.

In one or more embodiments, a compound represented by Formula 601 may berepresented by Formula 601-1:

In Formula 601-1,

X₆₁₄ may be N or C(R₆₁₄), X₆₁₅ may be N or C(R₆₁₅), X₆₁₆ may be N orC(R₆₁₆), and at least one selected from X₆₁₄ to X₆₁₆ may be N,

L₆₁₁ to L₆₁₃ may each independently be the same as defined in connectionwith L₆₀₁,

xe611 to xe613 may each independently be the same as defined inconnection with xe1,

R₆₁₁ to R₆₁₃ may each independently be the same as defined in connectionwith R₆₀₁,

R₆₁₄ to R₆₁₆ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group.

In one embodiment, L₆₀₁ and L₆₁₁ to L₆₁₃ in Formulae 601 and 601-1 mayeach independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a thiophenyl group, afuranyl group, a carbazolyl group, an indolyl group, an isoindolylgroup, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, animidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolylgroup, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, anoxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, abenzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinylgroup, and an azacarbazolyl group,

but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and601-1 may each independently be 0, 1, or 2.

In one or more embodiments, R₆₀₁ and R₆₁₁ to R₆₁₃ in Formula 601 and601-1 may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, aperylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a thiophenyl group, a furanyl group, a carbazolyl group, anindolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group; and

—S(═O)₂(Q₆₀₁) and —P(═O)(Q₆₀₁)(Q₆₀₂), and

Q₆₀₁ and Q₆₀₂ are the same as described above with respect to Formula601.

The electron transport region may include at least one compound selectedfrom Compounds ET1 to ET36, but embodiments of the present disclosureare not limited thereto:

In one embodiment, the electron transport region may include at leastone compound selected from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq₃, BAlq,3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ), NTAZ, and diphenyl(4-(triphenylsilyl)phenyl)-phosphine oxide(TSPO1):

A thickness of the buffer layer, the hole blocking layer, or theelectron control layer may be in a range of about 20 Å to about 1,000 Å,for example, about 30 Å to about 300 Å. When the thicknesses of thebuffer layer, the hole blocking layer, and the electron control layerare within these ranges, the electron blocking layer may have suitable(e.g., excellent) electron blocking characteristics or electron controlcharacteristics without a substantial increase in driving voltage.

A thickness of the electron transport layer may be in a range of about100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. Whenthe thickness of the electron transport layer is within the rangesdescribed above, the electron transport layer may have satisfactoryelectron transport characteristics without a substantial increase indriving voltage.

The electron transport region (for example, the electron transport layerin the electron transport region) may further include, in addition tothe materials described above, a metal-containing material.

The metal-containing material may include at least one selected fromalkali metal complex and alkaline earth-metal complex. The alkali metalcomplex may include a metal ion selected from a Li ion, a Na ion, a Kion, a Rb ion, and a Cs ion, and the alkaline earth-metal complex mayinclude a metal ion selected from a Be ion, a Mg ion, a Ca ion, a Srion, and a Ba ion. A ligand coordinated with the metal ion of the alkalimetal complex or the alkaline earth-metal complex may be selected from ahydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, ahydroxy acridine, a hydroxy phenanthridine, a hydroxy phenyloxazole, ahydroxy phenylthiazole, a hydroxy diphenyloxadiazole, a hydroxydiphenylthiadiazol, a hydroxy phenylpyridine, a hydroxyphenylbenzimidazole, a hydroxy phenylbenzothiazole, a bipyridine, aphenanthroline, and a cyclopentadiene, but embodiments of the presentdisclosure are not limited thereto.

For example, the metal-containing material may include a Li complex. TheLi complex may include, for example, Compound ET-D1 (lithium quinolate,LiQ) or ET-D2.

The electron transport region may include an electron injection layerthat facilitates injection of electrons from the second electrode 190.The electron injection layer may directly contact the second electrode190.

The electron injection layer may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron injection layer may include an alkali metal, an alkalineearth metal, a rare earth metal, an alkali metal compound, an alkalineearth-metal compound, a rare earth metal compound, an alkali metalcomplex, an alkaline earth-metal complex, a rare earth metal complex, orany combinations thereof.

The alkali metal may be selected from Li, Na, K, Rb, and Cs. In oneembodiment, the alkali metal may be Li, Na, and/or Cs. In one or moreembodiments, the alkali metal may be Li and/or Cs, but embodiments ofthe present disclosure are not limited thereto.

The alkaline earth metal may be selected from Mg, Ca, Sr, and Ba.

The rare earth metal may be selected from Sc, Y, Ce, Tb, Yb, and Gd.

The alkali metal compound, the alkaline earth-metal compound, and therare earth metal compound may be selected from oxides and halides (forexample, fluorides, chlorides, bromides, and/or iodides) of the alkalimetal, the alkaline earth-metal, and the rare earth metal.

The alkali metal compound may be selected from alkali metal oxides, suchas Li₂O, Cs₂O, and/or K₂O, and alkali metal halides, such as LiF, NaF,CsF, KF, LiI, NaI, CsI, and/or KI. In one embodiment, the alkali metalcompound may be selected from LiF, Li₂O, NaF, LiI, NaI, CsI, and KI, butembodiments of the present disclosure are not limited thereto.

The alkaline earth-metal compound may be selected from alkalineearth-metal oxides, such as BaO, SrO, CaO, Ba_(x)Sr_(1-x)O (0<x<1), andBa_(x)Ca_(1-x)O (0<x<1). In one embodiment, the alkaline earth-metalcompound may be selected from BaO, SrO, and CaO, but embodiments of thepresent disclosure are not limited thereto.

The rare earth metal compound may be selected from YbF₃, ScF₃, ScO₃,Y₂O₃, Ce₂O₃, GdF₃, and TbF₃. In one embodiment, the rare earth metalcompound may be selected from YbF₃, ScF₃, TbF₃, YbI₃, ScI₃, and TbI₃,but embodiments of the present disclosure are not limited thereto.

The alkali metal complex, the alkaline earth-metal complex, and the rareearth metal complex may include an ion of alkali metal, alkalineearth-metal, and rare earth metal as described above, and a ligandcoordinated with a metal ion of the alkali metal complex, the alkalineearth-metal complex, or the rare earth metal complex may be selectedfrom hydroxy quinoline, hydroxy isoquinoline, hydroxy benzoquinoline,hydroxy acridine, hydroxy phenanthridine, hydroxy phenyloxazole, hydroxyphenylthiazole, hydroxy diphenyloxadiazole, hydroxy diphenylthiadiazol,hydroxy phenylpyridine, hydroxy phenylbenzimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthroline, and cyclopentadiene,but embodiments of the present disclosure are not limited thereto.

The electron injection layer may include or consist of (i.e., includeonly) an alkali metal, an alkaline earth metal, a rare earth metal, analkali metal compound, an alkaline earth-metal compound, a rare earthmetal compound, an alkali metal complex, an alkaline earth-metalcomplex, a rare earth metal complex, or any combinations thereof, asdescribed above. In one or more embodiments, the electron injectionlayer may further include an organic material. When the electroninjection layer further includes an organic material, an alkali metal,an alkaline earth metal, a rare earth metal, an alkali metal compound,an alkaline earth-metal compound, a rare earth metal compound, an alkalimetal complex, an alkaline earth-metal complex, a rare earth metalcomplex, or any combinations thereof may be homogeneously ornon-homogeneously dispersed in a matrix including the organic material.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, for example, about 3 Å to about 90 Å. When thethickness of the electron injection layer is within the ranges describedabove, the electron injection layer may have satisfactory electroninjection characteristics without a substantial increase in drivingvoltage.

Second Electrode 190

The second electrode 190 may be disposed on the organic layer 150 havingsuch a structure. The second electrode 190 may be a cathode which is anelectron injection electrode, and in this regard, a material for formingthe second electrode 190 may be selected from a metal, an alloy, anelectrically conductive compound, and a combination thereof, which havea relatively low work function.

The second electrode 190 may include at least one selected from lithium(Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium(Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver(Mg—Ag), ITO, and IZO, but embodiments of the present disclosure are notlimited thereto. The second electrode 190 may be a transmissiveelectrode, a semi-transmissive electrode, or a reflective electrode.

The second electrode 190 may have a single-layered structure, or amulti-layered structure including two or more layers.

Description of FIGS. 2 to 4

An organic light-emitting device 20 of FIG. 2 includes a first cappinglayer 210, a first electrode 110, an organic layer 150, and a secondelectrode 190, which are sequentially stacked in this stated order; anorganic light-emitting device 30 of FIG. 3 includes a first electrode110, an organic layer 150, a second electrode 190, and a second cappinglayer 220, which are sequentially stacked in this stated order; and anorganic light-emitting device 40 of FIG. 4 includes a first cappinglayer 210, a first electrode 110, an organic layer 150, a secondelectrode 190, and a second capping layer 220, which are sequentiallystacked in this stated order.

Regarding FIGS. 2 to 4 , the first electrode 110, the organic layer 150,and the second electrode 190 may be understood by referring to thedescription presented in connection with FIG. 1 .

In the organic layer 150 of each of the organic light-emitting devices20 and 40, light generated in an emission layer may pass through thefirst electrode 110, which is a semi-transmissive electrode or atransmissive electrode, and the first capping layer 210 toward theoutside, and in the organic layer 150 of each of the organiclight-emitting devices 30 and 40, light generated in an emission layermay pass through the second electrode 190, which is a semi-transmissiveelectrode or a transmissive electrode, and the second capping layer 220toward the outside.

The first capping layer 210 and the second capping layer 220 mayincrease external luminescent efficiency according to the principle ofconstructive interference.

The first capping layer 210 and the second capping layer 220 may eachindependently be an organic capping layer including an organic material,an inorganic capping layer including an inorganic material, or acomposite capping layer including an organic material and an inorganicmaterial.

At least one selected from the first capping layer 210 and the secondcapping layer 220 may each independently include at least one materialselected from carbocyclic compounds, heterocyclic compounds, amine-basedcompounds, porphyrine derivatives, phthalocyanine derivatives,naphthalocyanine derivatives, alkali metal complexes, and alkalineearth-based complexes. The carbocyclic compound, the heterocycliccompound, and the amine-based compound may be optionally substitutedwith a substituent containing (e.g., including) at least one elementselected from O, N, S, Se, Si, F, Cl, Br, and I. In one embodiment, atleast one selected from the first capping layer 210 and the secondcapping layer 220 may each independently include an amine-basedcompound.

In one embodiment, at least one selected from the first capping layer210 and the second capping layer 220 may each independently include thecompound represented by Formula 201 or the compound represented byFormula 202.

In one or more embodiments, at least one selected from the first cappinglayer 210 and the second capping layer 220 may each independentlyinclude a compound selected from Compounds HT28 to HT33 and CompoundsCP1 to CP5, but embodiments of the present disclosure are not limitedthereto.

Hereinbefore, the organic light-emitting device according to anembodiment has been described in connection with FIGS. 1 to 4 . However,embodiments of the present disclosure are not limited thereto.

Layers constituting the hole transport region, an emission layer, andlayers constituting the electron transport region may be formed in acertain region by utilizing one or more suitable methods selected fromvacuum deposition, spin coating, casting, Langmuir-Blodgett (LB)deposition, ink-jet printing, laser-printing, and laser-induced thermalimaging.

When layers constituting the hole transport region, an emission layer,and layers constituting the electron transport region are formed byvacuum deposition, the deposition may be performed at a depositiontemperature of about 100° C. to about 500° C., a vacuum degree of about10⁻⁸ torr to about 10⁻³ torr, and a deposition speed of about 0.01 Å/secto about 100 Å/sec by taking into account a material to be included in alayer to be formed, and the structure of a layer to be formed.

When layers constituting the hole transport region, an emission layer,and layers constituting the electron transport region are formed by spincoating, the spin coating may be performed at a coating speed of about2000 rpm to about 5000 rpm and at a heat treatment temperature of about80° C. to 200° C. by taking into account a material to be included in alayer to be formed, and the structure of a layer to be formed.

Display Apparatus

The organic light-emitting device according to an embodiment may beincluded in a display device including a thin film transistor. The thinfilm transistor may include a gate electrode, source and drainelectrodes, a gate insulating film, and an active layer, and one of thesource and drain electrodes may electrically contact a first electrodeof the organic light-emitting device.

The active layer may include crystalline silicon, amorphous silicon,organic semiconductor, oxide semiconductor, and/or the like, butembodiments of the present disclosure are not limited thereto.

The display apparatus may further include a sealing member that sealsthe organic light-emitting device. The sealing member may enable theimplementation of an image in the organic light-emitting device, and mayreduce or prevent penetration of external air and moisture into theorganic light-emitting device. The sealing member may be a sealingsubstrate made of glass and/or plastic. The sealing member may be athin-film encapsulation layer including a plurality of organic layersand/or a plurality of inorganic layers. When the sealing member is athin-film encapsulation layer, the whole flat display apparatus may bemade flexible.

General Definition of Substituents

The term “π electron-depleted nitrogen-containing ring” as used hereinrefers to, for example, a cyclic group having at least one *—N=*′moiety, and examples thereof include an imidazole group, a pyrazolegroup, a thiazole group, an isothiazole group, an oxazole group, anisoxazole group, a pyridine group, a pyrazine group, a pyridazine group,a pyrimidine group, an indazole group, a purine group, a quinolinegroup, an isoquinoline group, a benzoquinoline group, a phthalazinegroup, a naphthyridine group, a quinoxaline group, a quinazoline group,a cinnoline group, a phenanthridine group, an acridine group, aphenanthroline group, a phenazine group, a benzimidazole group, anisobenzothiazole group, a benzoxazole group, an isobenzoxazole group, atriazole group, a tetrazole group, an oxadiazole group, a triazinegroup, s thiadiazol group, an imidazopyridine group, animidazopyrimidine group, and an azacarbazole group, but embodiments ofthe present disclosure are not limited thereto.

Examples of the π electron-depleted nitrogen-free cyclic group include abenzene group, a heptalene group, an indene group, a naphthalene group,an azulene group, a heptalene group, an indacene group, acenaphthylenegroup, a fluorene group, a spiro-bifluorene group, a benzofluorenegroup, a dibenzofluorene group, a phenalene group, a phenanthrene group,an anthracene group, a fluoranthene group, a triphenylene group, apyrene group, a chrysene group, a naphthacene group, a picene group, aperylene group, a pentacene group, a hexacene group, a pentacene group,a rubicene group, a corozen group, an ovalene group, a pyrrole group, anisoindole group, an indole group, a furan group, a thiophene group, abenzofuran group, a benzothiophene group, a benzocarbazole group, adibenzocarbazole group, a dibenzofuran group, a dibenzothiophene group,a dibenzothiophene sulfone group, a carbazole group, a dibenzosilolegroup, an indenocarbazole group, an indolocarbazole group, abenzofurocarbazole group, a benzothienocarbazole group and atriindolobenzene group, but embodiments of the present disclosure arenot limited thereto.

The term “C₁-C₆₀ alkyl group” as used herein refers to a linear orbranched saturated aliphatic hydrocarbon monovalent group having 1 to 60carbon atoms, and examples thereof include a methyl group, an ethylgroup, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an isoamyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group” as used herein refers to a divalentgroup having the same structure as the C₁-C₆₀ alkyl group.

The term “C₂-C₆₀ alkenyl group” as used herein refers to a hydrocarbongroup having at least one double bond in the middle or at the terminusof the C₂-C₆₀ alkyl group, and examples thereof include an ethenylgroup, a propenyl group, and a butenyl group. The term “C₂₋₆₀ alkenylenegroup” as used herein refers to a divalent group having the samestructure as the C₂-C₆₀ alkenyl group.

The term “C₂-C₆₀ alkynyl group” as used herein refers to a hydrocarbongroup having at least one triple bond in the middle or at the terminusof the C₂-C₆₀ alkyl group, and examples thereof include an ethynylgroup, and a propynyl group. The term “0C₂-C₆₀ alkynylene group” as usedherein refers to a divalent group having the same structure as theC₂-C₆₀ alkynyl group.

The term “C₁-C₆₀ alkoxy group” as used herein refers to a monovalentgroup represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group),and examples thereof include a methoxy group, an ethoxy group, and anisopropyloxy group.

The term “C₃-C₁₀ cycloalkyl group” as used herein refers to a monovalentsaturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, andexamples thereof include a cyclopropyl group, a cyclobutyl group, acyclopentyl group, a cyclohexyl group, and a cycloheptyl group. The term“C₃-C₁₀ cycloalkylene group” as used herein refers to a divalent grouphaving the same structure as the C₃-C₁₀ cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group” as used herein refers to amonovalent monocyclic group having at least one heteroatom selected fromN, O, Si, P, and S as a ring-forming atom in addition to 1 to 10 carbonatoms, and examples thereof include a 1,2,3,4-oxatriazolidinyl group, atetrahydrofuranyl group, and a tetrahydrothiophenyl group. The term“C₁-C₁₀ heterocycloalkylene group” as used herein refers to a divalentgroup having the same structure as the C₁-C₁₀ heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group” as used herein refers to amonovalent monocyclic group that has 3 to 10 carbon atoms and at leastone double bond in the ring thereof and no aromaticity, and examplesthereof include a cyclopentenyl group, a cyclohexenyl group, and acycloheptenyl group. The term “C₃-C₁₀ cycloalkenylene group” as usedherein refers to a divalent group having the same structure as theC₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein refers to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one double bond in its ring. Non-limiting examples of theC₁-C₁₀ heterocycloalkenyl group include a4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, anda 2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup” as used herein refers to a divalent group having the samestructure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein refers to a monovalent grouphaving a carbocyclic aromatic system having 6 to 60 carbon atoms, andthe term “C₆-C₆₀ arylene group” as used herein refers to a divalentgroup having a carbocyclic aromatic system having 6 to 60 carbon atoms.Examples of the C₆-C₆₀ aryl group are a phenyl group, a naphthyl group,an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and achrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene groupeach include two or more rings, the rings may be fused to each other.

The term “C₁-C₆₀ heteroaryl group” as used herein refers to a monovalentgroup having a carbocyclic aromatic system that has at least oneheteroatom selected from N, O, Si, P, and S as a ring-forming atom, inaddition to 1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylene group”as used herein refers to a divalent group having a carbocyclic aromaticsystem that has at least one heteroatom selected from N, O, Si, P, and Sas a ring-forming atom, in addition to 1 to 60 carbon atoms. Examples ofthe C₁-C₆₀ heteroaryl group are a pyridinyl group, a pyrimidinyl group,a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinylgroup, and an isoquinolinyl group. When the C₁-C₆₀ heteroaryl group andthe C₁-C₆₀ heteroarylene group each include two or more rings, the ringsmay be fused to each other.

The term “C₆-C₆₀ aryloxy group” as used herein refers to a grouprepresented by —OA₁₀₂ (wherein A₁₀₂ is the C₆-C₆₀ aryl group), and theterm “C₆-C₆₀ arylthio group” refers to a group represented by —SA₁₀₃(wherein A₁₀₃ is the C₆-C₆₀ aryl group).

The term “C₁-C₆₀ heteroaryloxy group” as used herein refers to a grouprepresented by —OA₁₀₄ (wherein A₁₀₄ is the C₁-C₆₀ heteroaryl group), andthe term “C₆-C₆₀ heteroarylthio group” as used herein refers to a grouprepresented by —SA₁₀₅ (wherein A₁₀₅ is the C₁-C₆₀ heteroaryl group).

The term “monovalent non-aromatic condensed polycyclic group” as usedherein refers to a monovalent group (for example, having 8 to 60 carbonatoms) having two or more rings condensed with each other, only carbonatoms as ring-forming atoms, and no aromaticity in its entire molecularstructure. An example of the monovalent non-aromatic condensedpolycyclic group is a fluorenyl group. The term “divalent non-aromaticcondensed polycyclic group” as used herein refers to a divalent grouphaving the same structure as the monovalent non-aromatic condensedpolycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” asused herein refers to a monovalent group (for example, having 1 to 60carbon atoms) having two or more rings condensed to each other, at leastone heteroatom selected from N, O, Si, P, and S, other than carbonatoms, as a ring-forming atom, and no aromaticity in its entiremolecular structure. An example of the monovalent non-aromatic condensedheteropolycyclic group is a carbazolyl group. The term “divalentnon-aromatic condensed heteropolycyclic group” as used herein refers toa divalent group having the same structure as the monovalentnon-aromatic condensed heteropolycyclic group.

The term “C₅-C₆₀ carbocyclic group” as used herein refers to amonocyclic or polycyclic group having 5 to 60 carbon atoms in which thering-forming atoms include only carbon atoms. The C₅-C₆₀ carbocyclicgroup may be an aromatic carbocyclic group or a non-aromatic carbocyclicgroup. The C₅-C₆₀ carbocyclic group may be a ring (such as benzene), amonovalent group (such as a phenyl group), or a divalent group (such asa phenylene group). In one or more embodiments, depending on the numberof substituents connected to the C₅-C₆₀ carbocyclic group, the C₅-C₆₀carbocyclic group may be a trivalent group or a quadrivalent group.

The term “C₁-C₆₀ heterocyclic group” as used herein refers to a grouphaving the same structure as the C₅-C₆₀ carbocyclic group, except thatas a ring-forming atom, at least one heteroatom selected from N, O, Si,P, and S is utilized in addition to the carbon atom (the number ofcarbon atoms may be in a range of 1 to 60).

In the specification, at least one substituent of the substituted C₅-C₆₀carbocyclic group, the substituted C₁-C₆₀ heterocyclic group, thesubstituted C₃-C₁₀ cycloalkylene group, the substituted C₁-C₁₀heterocycloalkylene group, the substituted C₃-C₁₀ cycloalkenylene group,the substituted C₁-C₁₀ heterocycloalkenylene group, the substitutedC₆-C₆₀ arylene group, the substituted C₁-C₆₀ heteroarylene group, thesubstituted divalent non-aromatic condensed polycyclic group, thesubstituted divalent non-aromatic condensed heteropolycyclic group, thesubstituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group,the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxygroup, the substituted C₃-C₀₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arylthio group, the substituted C₁-C₆₀ heteroaryl group, the substitutedC₁-C₆₀ hetero aryloxy group, the substituted C₁-C₆₀ hetero arylthiogroup, the substituted monovalent non-aromatic condensed polycyclicgroup, and the substituted monovalent non-aromatic condensedheteropolycyclic group may be selected from:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a C₁-C₆₀ hetero aryloxy group, a C₁-C₆₀ heteroarylthio group, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),—S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a C₁-C₆₀ hetero aryloxy group, a C₁-C₆₀ heteroarylthio group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a C₁-C₆₀ hetero aryloxy group, a C₁-C₆₀ heteroarylthio group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, aC₁-C₆₀ hetero aryloxy group, a C₁-C₆₀ hetero arylthio group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃),—N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and—P(═O)(Q₂₁)(Q₂₂); and

—Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and

Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently beselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a C₁-C₆₀ hetero aryloxy group, a C₁-C₆₀ hetero arylthio group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, a C₁-C₆₀ alkyl groupsubstituted with at least one selected from deuterium, —F, and a cyanogroup, a C₆-C₆₀ aryl group substituted with at least one selected fromdeuterium, —F, and a cyano group, a biphenyl group, and a terphenylgroup.

The term “Ph” as used herein refers to a phenyl group, the term “Me” asused herein refers to a methyl group, the term “Et” as used hereinrefers to an ethyl group, the term “ter-Bu” or “But” as used hereinrefers to a tert-butyl group, and the term “OMe” as used herein refersto a methoxy group.

The term “biphenyl group” as used herein refers to “a phenyl groupsubstituted with a phenyl group.” In other words, the “biphenyl group”is a substituted phenyl group having a C₆-C₆₀ aryl group as asubstituent.

The term “terphenyl group” as used herein refers to “a phenyl groupsubstituted with a biphenyl group.” In other words, the “terphenylgroup” is a phenyl group having, as a substituent, a C₆-C₆₀ aryl groupsubstituted with a C₆-C₆₀ aryl group.

* and *′ as used herein, unless defined otherwise, each refer to abinding site to a neighboring atom in a corresponding formula.

Hereinafter, a compound according to embodiments and an organiclight-emitting device according to embodiments will be described in moredetail with reference to Synthesis Examples and Examples. The wording “Bwas utilized instead of A” used in describing Synthesis Examples refersto that an identical molar equivalent of B was utilized in place of A.

EXAMPLES Example 1

As an anode, an ITO substrate, on which ITO/Ag/ITO were deposited, wascut to a size of 50 mm×50 mm×0.7 mm, sonicated with isopropyl alcoholand pure water for 5 minutes each, and then cleaned by exposure toultraviolet rays and ozone for 30 minutes. Then, the ITO substrate wasprovided to a vacuum deposition apparatus.

Compound HT3 and F4-TCNQ were vacuum-deposited on the ITO substrate at aweight ratio of 98:2 to form a hole injection layer having a thicknessof 100 Å, Compound HT3 was vacuum-deposited on the hole injection layerto form a hole transport layer having a thickness of 1,200 Å, andCompounds H001, T001, and D001 were co-deposited on the hole transportlayer at a weight ratio of 70:29.5:0.5 to form an emission layer havinga thickness of 300 Å. Compound ET-1 and LiQ were co-deposited on theemission layer at a weight ratio of 50:50 to form an electron transportlayer having a thickness of 310 Å. LiQ was deposited on the electrontransport layer to form an electron injection layer having a thicknessof 10 Å, and Mg and Ag (at a weight ratio of 130:10) were co-depositedon the electron injection layer to form a cathode having a thickness of130 Å, thereby completing the manufacture of an organic light-emittingdevice.

Examples 2 to 11 and Comparative Examples 1 to 5

Organic light-emitting devices were manufactured in the same manner asin Example 1, except that Compounds shown in Table 1 were each utilizedin forming an emission layer.

Evaluation Example

The current efficiency and lifespan of the organic light-emittingdevices manufactured according to Examples 1 to 11 and ComparativeExamples 1 to 5 were measured at 10 mA/cm² by utilizing Keithley SMU 236and a luminance meter PR650, and results thereof are shown in Table 1.The lifespan represents an amount of time that lapsed when luminance was95% of the initial luminance (100%). In addition, the lifespan wasexpressed with a relative value with respect to Comparative Example 1.That is, the lifespan was a relative value calculated utilizing thelifespan value of Comparative Example 1 as 100%.

TABLE 1 Emission layer Weight ratio (first compound:second First SecondThird compound:third Emission Efficiency Lifespan compound compoundcompound compound) color (cd/A) (%) Example 1 H001 T001 D001 70:29.5:0.5Red 20.2 180 Example 2 H001 T001 D001 80:19.5:0.5 Red 21.3 165 Example 3H001 T001 D001 70:29:1 Red 19.0 170 Example 4 H002 T001 D001 70:29.5:0.5Red 19.5 180 Example 5 H002 T001 D001 80:19.5:0.5 Red 20.1 170 Example 6H003 T001 D001 70:29.5:0.5 Red 21.0 195 Example 7 H003 T001 D00180:19.5:0.5 Red 22.7 170 Example 8 H004 T001 D001 70:29.5:0.5 Red 21.3190 Example 9 H004 T001 D001 80:19.5:0.5 Red 22.0 185 Example 10 H001T002 D001 70:29.5:0.5 Red 22.5 165 Example 11 H001 T002 D001 80:19.5:0.5Red 23.6 150 Comparative H001 T001 DCJTB 70:29.5:0.5 Red 7.1 100 Example1 Comparative H001 T001 — 70:30 yellowish 28 30 Example 2 greenComparative H001 — DCJTB 95:5 Red 2.8 110 Example 3 Comparative HX01TX01 DX01 70:29.5:0.5 Green 32 70 Example 4 Comparative HX02 TX02 DX0270:29.5:0.5 Blue 5.2 7 Example 5

Referring to Table 1, it is confirmed that the current efficiency andlifespan of the organic light-emitting devices of Examples 1 to 11 arebetter (e.g., more excellent) than those of the organic light-emittingdevices of Comparative Examples 1 to 5. For example, it is confirmedthat the organic light-emitting devices of Examples 1 to 3 havesignificantly improved lifespan while maintaining a similar or improvedcurrent efficiency.

An organic light-emitting device according to an embodiment may havehigh efficiency and a long lifespan.

Expressions such as “at least one of,” when preceding a list ofelements, modify the entire list of elements and do not modify theindividual elements of the list. Further, the use of “may” whendescribing embodiments of the present invention refers to “one or moreembodiments of the present invention.” Also, the term “exemplary” isintended to refer to an example or illustration.

It will be understood that when an element or layer is referred to asbeing “on,” “connected to,” or “coupled to” another element or layer, itcan be directly on, connected to, or coupled to the other element orlayer, or one or more intervening elements or layers may be present.

As used herein, the terms “substantially,” “about,” and similar termsare used as terms of approximation and not as terms of degree, and areintended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art. Further, the use of “may” when describing embodiments of thepresent disclosure refers to “one or more embodiments of the presentdisclosure.” Also, the term “exemplary” is intended to refer to anexample or illustration.

Also, any numerical range recited herein is intended to include allsub-ranges of the same numerical precision subsumed within the recitedrange. For example, a range of “1.0 to 10.0” is intended to include allsubranges between (and including) the recited minimum value of 1.0 andthe recited maximum value of 10.0, that is, having a minimum value equalto or greater than 1.0 and a maximum value equal to or less than 10.0,such as, for example, 2.4 to 7.6. Any maximum numerical limitationrecited herein is intended to include all lower numerical limitationssubsumed therein, and any minimum numerical limitation recited in thisspecification is intended to include all higher numerical limitationssubsumed therein. Accordingly, Applicant reserves the right to amendthis specification, including the claims, to expressly recite anysub-range subsumed within the ranges expressly recited herein.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

While one or more embodiments have been described with reference to thefigures, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope as defined by the following claims,and equivalents thereof.

What is claimed is:
 1. An organic light-emitting device comprising: afirst electrode; a second electrode; and an organic layer between thefirst electrode and the second electrode, wherein the organic layercomprises an emission layer, the emission layer comprises a firstcompound, a second compound, and a third compound, the first compound isrepresented by Formula 1, the second compound is represented by Formula2, the third compound is represented by Formula 3, and the firstcompound and the second compound are different from each other:

wherein, in Formulae 1 to 3, 1A, and 2A to 2C, L₁₁ is selected from thegroup consisting of: a π electron-depleted nitrogen-free cyclic group;and a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from the group consisting of deuterium, a C₁-C₆₀alkyl group, a π electron-depleted nitrogen-free cyclic group, and—Si(Q₃₁)(Q₃₂)(Q₃₃), a11 is selected from the group consisting of 0, 1,2, and 3, Y₁₁ is a group represented by Formula 1A, Y₁₂ is selected fromthe group consisting of: —F, a cyano group, and a π electron-depletednitrogen-containing cyclic group; a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group, each substituted with atleast one selected from the group consisting of —F and a cyano group;and a π electron-depleted nitrogen-containing cyclic group substitutedwith at least one selected from the group consisting of deuterium, aC₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, c11 and c12are each independently selected from the group consisting of 1, 2, and3, X₁₁ is selected from the group consisting of a single bond, N(R₁₃),O, and S, X₁₂ is selected from the group consisting of a single bond,N(R₁₄), O, and S, X₁₁ and X₁₂ are not a single bond at the same time,A₁₁ and A₁₂ are each independently a π electron-depleted nitrogen-freecyclic group or a substituted or unsubstituted carbazole group, R₁₁ toR₁₄ are each independently selected from the group consisting of: abinding site, hydrogen, deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₁)(Q₂)(Q₃); a πelectron-depleted nitrogen-free cyclic group substituted with at leastone selected from the group consisting of deuterium, a C₁-C₆₀ alkylgroup, a π electron-depleted nitrogen-free cyclic group, and—Si(Q₃₁)(Q₃₂)(Q₃₃); and a π electron-depleted nitrogen-free cyclic groupsubstituted with a π electron-depleted nitrogen-free cyclic group thatis substituted with at least one selected from the group consisting ofdeuterium, a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-freecyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selected from thegroup consisting of R₁₁ to R₁₄ is a binding site, b11 and b12 are eachindependently selected from the group consisting of 1, 2, 3, 4, 5, and6, L₂₁ is selected from the group consisting of a substituted orunsubstituted C₅-C₆₀ carbocyclic group and a substituted orunsubstituted C₁-C₆₀ heterocyclic group, a21 is selected from the groupconsisting of 0, 1, 2, and 3, Y₂₁ is a group represented by one selectedfrom the group consisting of Formulae 2A to 2C, Y₂₂ is selected from thegroup consisting of: —F, a cyano group, and a π electron-depletednitrogen-containing cyclic group; a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group, each substituted with atleast one selected from the group consisting of —F and a cyano group;and a π electron-depleted nitrogen-containing cyclic group substitutedwith at least one selected from the group consisting of deuterium, aC₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, c21 and c22are each independently selected from the group consisting of 1, 2, 3, 4,5, and 6, X₂₁ is selected from the group consisting of a single bond,N(R₂₄), O, and S, X₂₂ is selected from the group consisting of a singlebond, N(R₂₅), O, and S, X₂₃ is selected from the group consisting of asingle bond, N(R₂₆), O, and S, A₂₁ to A₂₃ are each independently a πelectron-depleted nitrogen-free cyclic group, R₂₁ to R₂₆ are eachindependently selected from the group consisting of: a binding site,hydrogen, deuterium, a C₁-C₆₀ alkyl group, a π electron-depletednitrogen-free cyclic group, —N(Q₁)(Q₂), and —Si(Q₁)(Q₂)(Q₃); a πelectron-depleted nitrogen-free cyclic group substituted with at leastone selected from the group consisting of deuterium, a C₁-C₆₀ alkylgroup, a π electron-depleted nitrogen-free cyclic group, —N(Q₃₁)(Q₃₂),and —Si(Q₃₁)(Q₃₂)(Q₃₃); and a π electron-depleted nitrogen-free cyclicgroup substituted with a π electron-depleted nitrogen-free cyclic groupthat is substituted with at least one selected from the group consistingof deuterium, a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-freecyclic group, —N(Q₂₁)(Q₂₂), and —Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selectedfrom the group consisting of R₂₁ to R₂₄ in Formula 2A is a binding site,one selected from the group consisting of R₂₁ to R₂₅ in Formula 2B is abinding site, and one selected from the group consisting of R₂₁ to R₂₆in Formula 2C is a binding site, b21 to b23 are each independentlyselected from the group consisting of 1, 2, 3, 4, 5, and 6, L₃₁ isselected from the group consisting of a substituted or unsubstitutedC₅-C₆₀ carbocyclic group and a substituted or unsubstituted C₁-C₆₀heterocyclic group, a31 is selected from the group consisting of 0, 1,2, and 3, R₃₁ to R₃₇ are each independently selected from the groupconsisting of hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkylgroup, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —B(Q₁)(Q₂),—N(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)(Q₁), —S(═O)₂(Q₁),—P(═O)(Q₁)(Q₂), and —P(═S)(Q₁)(Q₂), wherein R₃₁ to R₃₇ are optionallylinked to form a substituted or unsubstituted C₅-C₆₀ carbocyclic groupor a substituted or unsubstituted C₁-C₆₀ heterocyclic group, b31 isselected from the group consisting of 1, 2, 3, 4, 5, and 6, Y₃₁ and Y₃₂are each independently selected from the group consisting of —F, —Cl,—Br, —I, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₆-C₆₀ aryl group, and a substituted or unsubstitutedC₆-C₆₀ aryloxy group, wherein Y₃₁ and Y₃₂ are optionally linked to forma substituted or unsubstituted C₅-C₆₀ carbocyclic group or a substitutedor unsubstituted C₁-C₆₀ heterocyclic group, Q₁ to Q₃, Q₂₁ to Q₂₃, andQ₃₁ to Q₃₃ are each independently selected from the group consisting ofhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ hetero arylthio group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group, andindicates a binding site to a neighboring atom, and a weight ratio amongthe first compound, the second compound and the third compound is70:29:1 to 80:19.5:0.5.
 2. The organic light-emitting device of claim 1,wherein L₁₁ is selected from the group consisting of: a benzene group, anaphthalene group, a phenalene group, an anthracene group, afluoranthene group, a triphenylene group, a phenanthrene group, a pyrenegroup, a chrysene group, a perylene group, a fluorene group, a carbazolegroup, a dibenzofuran group, and a dibenzothiophene group; and a benzenegroup, a naphthalene group, a phenalene group, an anthracene group, afluoranthene group, a triphenylene group, a phenanthrene group, a pyrenegroup, a chrysene group, a perylene group, a fluorene group, a carbazolegroup, a dibenzofuran group, and a dibenzothiophene group, eachsubstituted with at least one selected from the group consisting ofdeuterium, a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, and a dinaphthothiophenyl group, and L₂₁ and L₃₁ are eachindependently selected from the group consisting of: a benzene group, anaphthalene group, a phenalene group, an anthracene group, afluoranthene group, a triphenylene group, a phenanthrene group, a pyrenegroup, a chrysene group, a perylene group, a pyridine group, apyrimidine group, a pyrazine group, a pyridazine group, a triazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a benzoisoquinoline group, a phthalazine group, a naphthyridine group, aquinoxaline group, a benzoquinoxaline group, a quinazoline group, abenzoquinazoline group, a fluorene group, a carbazole group, adibenzofuran group, and a dibenzothiophene group; and a benzene group, anaphthalene group, a phenalene group, an anthracene group, afluoranthene group, a triphenylene group, a phenanthrene group, a pyrenegroup, a chrysene group, a perylene group, a pyridine group, apyrimidine group, a pyrazine group, a pyridazine group, a triazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a benzoisoquinoline group, a phthalazine group, a naphthyridine group, aquinoxaline group, a benzoquinoxaline group, a quinazoline group, abenzoquinazoline group, a fluorene group, a carbazole group, adibenzofuran group, and a dibenzothiophene group, each substituted withat least one selected from the group consisting of deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group.3. The organic light-emitting device of claim 1, wherein X₁₁ is selectedfrom the group consisting of N(R₁₃), O, and S, and X₁₂ is a single bond.4. The organic light-emitting device of claim 1, wherein R₁₁ to R₁₄ areeach independently selected from the group consisting of: a bindingsite, hydrogen, deuterium, a C₁-C₂₀ alkyl group, a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a triphenylenyl group, a chrysenyl group, a fluoranthenyl group,a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, a dinaphthothiophenyl group, and —Si(Q₁)(Q₂)(Q₃); a phenyl group,a biphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, a triphenylenyl group, a chrysenyl group, a fluoranthenyl group,a fluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, and a dinaphthothiophenyl group, each substituted with at leastone selected from the group consisting of deuterium, a C₁-C₂₀ alkylgroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, and —Si(Q₃₁)(Q₃₂)(Q₃₃); and a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, and a dinaphthothiophenyl group, each substituted with at leastone selected from the group consisting of a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, and a dinaphthothiophenyl group that are each substituted with atleast one selected from the group consisting of deuterium, a C₁-C₂₀alkyl group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, and —Si(Q₂₁)(Q₂₂)(Q₂₃), one selected from the group consisting ofR₁₁ to R₁₄ is a binding site, and Q₁ to Q₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃are each independently selected from the group consisting of a C₁-C₂₀alkyl group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, and adinaphthothiophenyl group.
 5. The organic light-emitting device of claim1, wherein Y₁₂ is selected from the group consisting of: —F, a cyanogroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from the group consisting of—F and a cyano group; and a pyridinyl group, a pyrazinyl group, apyridazinyl group, a pyrimidinyl group, a triazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinolinyl group, an isoquinolinylgroup, a naphthyridinyl group, a quinoxalinyl group, a quinazolinylgroup, an azafluorenyl group, an azacarbazolyl group, anazadibenzofuranyl group, an azadibenzothiophenyl group, a diazafluorenylgroup, a diazacarbazolyl group, a diazadibenzofuranyl group, and adiazadibenzothiophenyl group, each substituted with at least oneselected from the group consisting of deuterium, a C₁-C₂₀ alkyl group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group.6. The organic light-emitting device of claim 1, wherein c11 and c12 areeach independently
 1. 7. The organic light-emitting device of claim 1,wherein X₂₁ is a single bond, X₂₂ is a single bond, and X₂₃ is a singlebond.
 8. The organic light-emitting device of claim 1, wherein Y₂₁ is agroup represented by Formula 2A.
 9. The organic light-emitting device ofclaim 1, wherein Y₂₂ is selected from the group consisting of: —F, acyano group, a pyridinyl group, a pyrazinyl group, a pyridazinyl group,a pyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from the group consisting of—F and a cyano group; and a pyridinyl group, a pyrazinyl group, apyridazinyl group, a pyrimidinyl group, a triazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinolinyl group, an isoquinolinylgroup, a naphthyridinyl group, a quinoxalinyl group, a quinazolinylgroup, an azafluorenyl group, an azacarbazolyl group, anazadibenzofuranyl group, an azadibenzothiophenyl group, a diazafluorenylgroup, a diazacarbazolyl group, a diazadibenzofuranyl group, and adiazadibenzothiophenyl group, each substituted with at least oneselected from the group consisting of deuterium, a C₁-C₂₀ alkyl group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group.10. The organic light-emitting device of claim 1, wherein c21 and c22are each independently selected from the group consisting of 1, 2, and3.
 11. The organic light-emitting device of claim 1, wherein R₃₁ to R₃₇are each independently selected from the group consisting of: hydrogen,deuterium, —F, —Cl, —Br, —I, a cyano group, a C₁-C₂₀ alkyl group, and aC₁-C₂₀ alkoxy group; a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, a triphenylenyl group, a chrysenyl group, afluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from the group consisting ofdeuterium, —F, —Cl, —Br, —I, a cyano group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;and —B(Q₁)(Q₂) and —N(Q₁)(Q₂), and Q₁ and Q₂ are each independentlyselected from the group consisting of: hydrogen, deuterium, and a C₁-C₂₀alkyl group; a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a phenanthrenyl group, a triphenylenyl group, achrysenyl group, a fluoranthenyl group, a fluorenyl group, a carbazolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzofluorenyl group, a benzocarbazolyl group, a benzonaphthofuranylgroup, a benzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group;and a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a phenanthrenyl group, a triphenylenyl group, a chrysenyl group,a fluoranthenyl group, a fluorenyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzofluorenyl group,a benzocarbazolyl group, a benzonaphthofuranyl group, abenzonaphthothiophenyl group, a dibenzofluorenyl group, adibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenylgroup, a pyridinyl group, a pyrazinyl group, a pyridazinyl group, apyrimidinyl group, a triazinyl group, a quinolinyl group, anisoquinolinyl group, a quinolinyl group, an isoquinolinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, anazafluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group,an azadibenzothiophenyl group, a diazafluorenyl group, a diazacarbazolylgroup, a diazadibenzofuranyl group, and a diazadibenzothiophenyl group,each substituted with at least one selected from the group consisting ofdeuterium, a C₁-C₂₀ alkyl group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, atriphenylenyl group, a chrysenyl group, a fluoranthenyl group, afluorenyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzofluorenyl group, a benzocarbazolylgroup, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, adibenzofluorenyl group, a dibenzocarbazolyl group, a dinaphthofuranylgroup, a dinaphthothiophenyl group, a pyridinyl group, a pyrazinylgroup, a pyridazinyl group, a pyrimidinyl group, a triazinyl group, aquinolinyl group, an isoquinolinyl group, a quinolinyl group, anisoquinolinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, an azafluorenyl group, an azacarbazolyl group, anazadibenzofuranyl group, an azadibenzothiophenyl group, a diazafluorenylgroup, a diazacarbazolyl group, a diazadibenzofuranyl group, and adiazadibenzothiophenyl group.
 12. The organic light-emitting device ofclaim 1, wherein Y₃₁ and Y₃₂ are each independently selected from thegroup consisting of —F, —Cl, —Br, —I, a C₁-C₂₀ alkyl group, and a C₁-C₂₀alkoxy group.
 13. The organic light-emitting device of claim 1, whereinthe first compound is selected from the group consisting of compounds ofGroup I, the second compound is selected from the group consisting ofcompounds of Group II, and the third compound is selected from the groupconsisting of compounds of Group III:


14. The organic light-emitting device of claim 1, wherein the secondcompound satisfies Condition 1:ΔE _(ST)(C2)≤0.3 eV,  Condition 1 wherein, in Condition 1, ΔE_(ST)(C2)is a difference between a lowest excitation singlet energy level of thesecond compound (E_(S) ₁ (C2)) and a lowest excitation triplet energylevel of the second compound (E_(T1)(C2)).
 15. The organiclight-emitting device of claim 1, wherein the third compound has amaximum emission wavelength in a range of about 520 nm to about 780 nm.16. The organic light-emitting device of claim 1, wherein the organiclayer further comprises a hole transport region, the hole transportregion is between the first electrode and the emission layer, the holetransport region comprises a first hole transport layer and a secondhole transport layer, the first hole transport layer comprises a firsthole transport material, the second hole transport layer comprises asecond hole transport material, and the first hole transport materialand the second hole transport material are different from each other.17. The organic light-emitting device of claim 16, wherein the firsthole transport material is represented by Formula 201:

wherein, in Formula 201, L₂₀₁ to L₂₀₃ are each independently selectedfrom the group consisting of a substituted or unsubstituted C₅-C₆₀carbocyclic group and a substituted or unsubstituted C₁-C₆₀ heterocyclicgroup, a201 to a203 are each independently selected from the groupconsisting of 0, 1, 2, and 3, Cz is a substituted or unsubstitutedcarbazolyl group, FIr is a substituted or unsubstituted fluorenyl group,and R₂₀₁ is selected from the group consisting of a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.18. The organic light-emitting device of claim 16, wherein the secondhole transport material is represented by Formula 202:

wherein, in Formulae 202 and 202A, L₂₁₁ to L₂₁₃ are each independentlyselected from the group consisting of a substituted or unsubstitutedC₅-C₆₀ carbocyclic group and a substituted or unsubstituted C₁-C₆₀heterocyclic group, a211 to a213 are each independently selected fromthe group consisting of 0, 1, 2, and 3, R₂₁₁ to R₂₁₃ are eachindependently selected from the group consisting of a group representedby Formula 202A, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group,a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, wherein at least one selected from the groupconsisting of R₂₁₁ to R₂₁₃ is a group represented by Formula 202A, X₂₂₁is selected from the group consisting of N(R₂₂₃), C(R₂₂₃)(R₂₂₄), O, andS, A₂₂₁ and A₂₂₂ are each independently selected from the groupconsisting of i) a 6-membered ring, ii) a condensed ring in which two ormore 6-membered rings are condensed with each other, and iii) acondensed ring in which at least one 6-membered ring and at least one5-membered ring are condensed with each other, R₂₂₁ to R₂₂₄ are eachindependently selected from the group consisting of a binding site,hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amino group, an amidino group, a hydrazine group, ahydrazone group, a carboxylic acid group or a salt thereof, a sulfonicacid group or a salt thereof, a phosphoric acid group or a salt thereof,a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, wherein one selected from the group consistingof R₂₂₁ to R₂₂₄ is a binding site, and b221 and b222 are eachindependently selected from the group consisting of 1, 2, 3, 4, 5, and6.
 19. The organic light-emitting device of claim 16, wherein the firsthole transport material is selected from the group consisting ofcompounds of Group IV, and the second hole transport material isselected from the group consisting of compounds of Group V:


20. A display apparatus comprising: a thin film transistor comprising asource electrode, a drain electrode, and an active layer; and theorganic light-emitting device of claim 1, wherein the first electrode ofthe organic light-emitting device is electrically connected to oneselected from the group consisting of the source electrode and the drainelectrode of the thin film transistor.
 21. An organic light-emittingdevice comprising: a first electrode; a second electrode; and an organiclayer between the first electrode and the second electrode, wherein theorganic layer comprises an emission layer, the emission layer comprisesa first compound, a second compound, and a third compound, the firstcompound is represented by Formula 1, the second compound is representedby Formula 2, the third compound is represented by Formula 3, and thefirst compound and the second compound are different from each other:

wherein, in Formulae 1 to 3, 1A, and 2A to 2C, L₁₁ is selected from thegroup consisting of: a π electron-depleted nitrogen-free cyclic group;and a π electron-depleted nitrogen-free cyclic group substituted with atleast one selected from the group consisting of deuterium, a C₁-C₆₀alkyl group, a π electron-depleted nitrogen-free cyclic group, and—Si(Q₃₁)(Q₃₂)(Q₃₃), a11 is selected from the group consisting of 0, 1,2, and 3, Y₁₁ is a group represented by Formula 1A, Y₁₂ is selected fromthe group consisting of: —F, a cyano group, and a π electron-depletednitrogen-containing cyclic group; a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group, each substituted with atleast one selected from the group consisting of —F and a cyano group;and a π electron-depleted nitrogen-containing cyclic group substitutedwith at least one selected from the group consisting of deuterium, aC₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, c11 and c12are each independently selected from the group consisting of 1, 2, and3, X₁₁ is selected from the group consisting of a single bond, N(R₁₃),O, and S, X₁₂ is selected from the group consisting of a single bond,N(R₁₄), O, and S, X₁₁ and X₁₂ are not a single bond at the same time,A₁₁ and A₁₂ are each independently a π electron-depleted nitrogen-freecyclic group or a substituted or unsubstituted carbazole group, R₁₁ toR₁₄ are each independently selected from the group consisting of: abinding site, hydrogen, deuterium, a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-free cyclic group, and —Si(Q₁)(Q₂)(Q₃); a πelectron-depleted nitrogen-free cyclic group substituted with at leastone selected from the group consisting of deuterium, a C₁-C₆₀ alkylgroup, a π electron-depleted nitrogen-free cyclic group, and—Si(Q₃₁)(Q₃₂)(Q₃₃); and a π electron-depleted nitrogen-free cyclic groupsubstituted with a π electron-depleted nitrogen-free cyclic group thatis substituted with at least one selected from the group consisting ofdeuterium, a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-freecyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selected from thegroup consisting of R₁₁ to R₁₄ is a binding site, b11 and b12 are eachindependently selected from the group consisting of 1, 2, 3, 4, 5, and6, L₂₁ is selected from the group consisting of a substituted orunsubstituted C₅-C₆₀ carbocyclic group and a substituted orunsubstituted C₁-C₆₀ heterocyclic group, a21 is selected from the groupconsisting of 0, 1, 2, and 3, Y₂₁ is a group represented by one selectedfrom the group consisting of Formulae 2A to 2C, Y₂₂ is selected from thegroup consisting of: —F, a cyano group, and a π electron-depletednitrogen-containing cyclic group; a C₁-C₆₀ alkyl group, a πelectron-depleted nitrogen-containing cyclic group, and a πelectron-depleted nitrogen-free cyclic group, each substituted with atleast one selected from the group consisting of —F and a cyano group;and a π electron-depleted nitrogen-containing cyclic group substitutedwith at least one selected from the group consisting of deuterium, aC₁-C₆₀ alkyl group, a π electron-depleted nitrogen-containing cyclicgroup, and a π electron-depleted nitrogen-free cyclic group, c21 and c22are each independently selected from the group consisting of 1, 2, 3, 4,5, and 6, X₂₁ is selected from the group consisting of a single bond,N(R₂₄), O, and S, X₂₂ is selected from the group consisting of a singlebond, N(R₂₅), O, and S, X₂₃ is selected from the group consisting of asingle bond, N(R₂₆), O, and S, A₂₁ to A₂₃ are each independently a πelectron-depleted nitrogen-free cyclic group, R₂₁ to R₂₆ are eachindependently selected from the group consisting of: a binding site,hydrogen, deuterium, a C₁-C₆₀ alkyl group, a π electron-depletednitrogen-free cyclic group, —N(Q₁)(Q₂), and —Si(Q₁)(Q₂)(Q₃); a πelectron-depleted nitrogen-free cyclic group substituted with at leastone selected from the group consisting of deuterium, a C₁-C₆₀ alkylgroup, a π electron-depleted nitrogen-free cyclic group, —N(Q₃₁)(Q₃₂),and —Si(Q₃₁)(Q₃₂)(Q₃₃); and a π electron-depleted nitrogen-free cyclicgroup substituted with a π electron-depleted nitrogen-free cyclic groupthat is substituted with at least one selected from the group consistingof deuterium, a C₁-C₆₀ alkyl group, a π electron-depleted nitrogen-freecyclic group, —N(Q₂₁)(Q₂₂), and —Si(Q₂₁)(Q₂₂)(Q₂₃), wherein one selectedfrom the group consisting of R₂₁ to R₂₄ in Formula 2A is a binding site,one selected from the group consisting of R₂₁ to R₂₅ in Formula 2B is abinding site, and one selected from the group consisting of R₂₁ to R₂₆in Formula 2C is a binding site, b21 to b23 are each independentlyselected from the group consisting of 1, 2, 3, 4, 5, and 6, L₃₁ isselected from the group consisting of a substituted or unsubstitutedC₅-C₆₀ carbocyclic group and a substituted or unsubstituted C₁-C₆₀heterocyclic group, a31 is selected from the group consisting of 0, 1,2, and 3, R₃₁ to R₃₇ are each independently selected from the groupconsisting of hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amino group, an amidino group, ahydrazine group, a hydrazone group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkylgroup, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —B(Q₁)(Q₂),—N(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)(Q₁), —S(═O)₂(Q₁),—P(═O)(Q₁)(Q₂), and —P(═S)(Q₁)(Q₂), wherein R₃₁ to R₃₇ are optionallylinked to form a substituted or unsubstituted C₅-C₆₀ carbocyclic groupor a substituted or unsubstituted C₁-C₆₀ heterocyclic group, b31 isselected from the group consisting of 1, 2, 3, 4, 5, and 6, Y₃₁ and Y₃₂are each independently selected from the group consisting of —F, —Cl,—Br, —I, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₆-C₆₀ aryl group, and a substituted or unsubstitutedC₆-C₆₀ aryloxy group, wherein Y₃₁ and Y₃₂ are optionally linked to forma substituted or unsubstituted C₅-C₆₀ carbocyclic group or a substitutedor unsubstituted C₁-C₆₀ heterocyclic group, Q₁ to Q₃, Q₂₁ to Q₂₃, andQ₃₁ to Q₃₃ are each independently selected from the group consisting ofhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ hetero arylthio group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, and a terphenyl group, and *indicates a binding site to a neighboring atom, and wherein the firstcompound is about 60 wt % to about 90 wt % in amount, the secondcompound is about 10 wt % to about 40 wt % in amount, and the thirdcompound is about 0.5 wt % to about 5 wt % in amount, each based on atotal weight of the emission layer, and a weight ratio among the firstcompound, the second compound and the third compound is 70:29:1 to80:19.5:0.5.